属性 ::before 对于 CSS 实现不起作用

问题描述 投票：0回答：1

我看不到之前的实现。

div-image 框中最后一个部分库中的属性之前

我照顾所有解决方案，例如内容或相对于父母的位置和绝对于孩子的位置，但我仍然没有看到::before。

不知道为什么没有出现
我仍在学习前端，并在 YouTube 的视频中看到了这个实现，它对于视频来说效果很好，但对我来说，我不明白为什么？？

HTML

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>3MJ</title>
    <link rel="stylesheet" href="css/normalize.css">
    <link rel="stylesheet" href="css/3mj.css">
    <link rel="stylesheet" href="css/all.min.css">

    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link
        href="https://fonts.googleapis.com/css2?family=Cairo:[email protected]&family=Open+Sans:ital,wght@0,300..800;1,300..800&display=swap"
        rel="stylesheet">
</head>

<body>

    <!-- Start Header -->

    <div class="header" id="header">
        <div class="container">
            <a href="#" class="logo">3MJ</a>
            <ul class="main-nav">
                <li><a href="#article">Article</a></li>
                <li><a href="#gallery">Gallery</a></li>
                <li><a href="#feature">Feature</a></li>
                <li><a href="#">Other Links</a>
                    <!-- Start Megamenu -->

                    <div class="mega-menu">
                        <div class="image">
                            <img src="images/megamenu.png" alt="">
                        </div>
                        <ul class="links">
                            <li>
                                <a href="#testimonials"><i class="far fa-comments fa-fw"></i> Testimonials</a>
                            </li>
                            <li>
                                <a href="#team"><i class="far fa-user fa-fw"></i> Team Members</a>
                            </li>
                            <li>
                                <a href="#services"><i class="far fa-building fa-fw"></i> Services</a>
                            </li>
                            <li>
                                <a href="#our-skills"><i class="far fa-check-circle fa-fw"></i> Our Skills</a>
                            </li>
                            <li>
                                <a href="#work-steps"><i class="far fa-clipboard fa-fw"></i> How It Works</a>
                            </li>
                        </ul>
                        <ul class="links">
                            <li>
                                <a href="#events"><i class="far fa-calendar-alt fa-fw"></i> Events</a>
                            </li>
                            <li>
                                <a href="#pricing"><i class="fas fa-server fa-fw"></i> Pricing Plans</a>
                            </li>
                            <li>
                                <a href="#video"><i class="far fa-play-circle fa-fw"></i> Top Videos</a>
                            </li>
                            <li>
                                <a href="#stats"><i class="far fa-chart-bar fa-fw"></i> Stats</a>
                            </li>
                            <li>
                                <a href="#discount"><i class="fas fa-percent fa-fw"></i> Request A Discount</a>
                            </li>
                        </ul>
                    </div>

                    <!-- End Megamenu -->
                </li>
            </ul>
        </div>
    </div>

    <!-- End Header -->

    <!-- Start Landing -->

    <div class="landing">
        <div class="container">
            <div class="text">
                <h1>Welcome, To 3MJ Store World</h1>
                <p>Here you will find your dream, your goals and what do you hope. We share happiness.</p>
            </div>
            <div class="image">
                <img src="images/landing-image.png" alt="">
            </div>
        </div>
        <a href="#article" class="go-down">
            <i class="fas fa-angle-double-down fa-2x"></i>
        </a>
    </div>

    <!-- End Landing -->

    <!-- Start Article -->

    <div class="article" id="article">
        <h2 class="main-title">ARTICLE</h2>
        <div class="container">
            <div class="box">
                <img src="images/cat-01.jpg" alt="">
                <div class="content">
                    <h3>Test Title</h3>
                    <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Reprehenderit</p>
                </div>
                <div class="info">
                    <a href="#">Read More</a>
                    <i class="fas fa-long-arrow-alt-right"></i>
                </div>
            </div>
            <div class="box">
                <img src="images/cat-02.jpg" alt="">
                <div class="content">
                    <h3>Test Title</h3>
                    <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Reprehenderit</p>
                </div>
                <div class="info">
                    <a href="#">Read More</a>
                    <i class="fas fa-long-arrow-alt-right"></i>
                </div>
            </div>
            <div class="box">
                <img src="images/cat-03.jpg" alt="">
                <div class="content">
                    <h3>Test Title</h3>
                    <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Reprehenderit</p>
                </div>
                <div class="info">
                    <a href="#">Read More</a>
                    <i class="fas fa-long-arrow-alt-right"></i>
                </div>
            </div>
            <div class="box">
                <img src="images/cat-04.jpg" alt="">
                <div class="content">
                    <h3>Test Title</h3>
                    <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Reprehenderit</p>
                </div>
                <div class="info">
                    <a href="#">Read More</a>
                    <i class="fas fa-long-arrow-alt-right"></i>
                </div>
            </div>
            <div class="box">
                <img src="images/cat-05.jpg" alt="">
                <div class="content">
                    <h3>Test Title</h3>
                    <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Reprehenderit</p>
                </div>
                <div class="info">
                    <a href="#">Read More</a>
                    <i class="fas fa-long-arrow-alt-right"></i>
                </div>
            </div>
            <div class="box">
                <img src="images/cat-06.jpg" alt="">
                <div class="content">
                    <h3>Test Title</h3>
                    <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Reprehenderit</p>
                </div>
                <div class="info">
                    <a href="#">Read More</a>
                    <i class="fas fa-long-arrow-alt-right"></i>
                </div>
            </div>
            <div class="box">
                <img src="images/cat-07.jpg" alt="">
                <div class="content">
                    <h3>Test Title</h3>
                    <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Reprehenderit</p>
                </div>
                <div class="info">
                    <a href="#">Read More</a>
                    <i class="fas fa-long-arrow-alt-right"></i>
                </div>
            </div>
            <div class="box">
                <img src="images/cat-08.jpg" alt="">
                <div class="content">
                    <h3>Test Title</h3>
                    <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Reprehenderit</p>
                </div>
                <div class="info">
                    <a href="#">Read More</a>
                    <i class="fas fa-long-arrow-alt-right"></i>
                </div>
            </div>
        </div>
    </div>

    <!-- End Article -->

    <!-- Start Gallery -->

    <div class="gallery" id="gallery">
        <h2 class="main-title">GALLERY</h2>
        <div class="container">
            <div class="box">
                <img src="images/gallery-01.png" alt="" class="image">
            </div>
            <div class="box">
                <img src="images/gallery-02.png" alt="" class="image">
            </div>
            <div class="box">
                <img src="images/gallery-03.jpg" alt="" class="image">
            </div>
            <div class="box">
                <img src="images/gallery-04.png" alt="" class="image">
            </div>
            <div class="box">
                <img src="images/gallery-05.jpg" alt="" class="image">
            </div>
            <div class="box">
                <img src="images/gallery-06.png" alt="" class="image">
            </div>
        </div>
    </div>

    <!-- End Gallery -->

</body>

</html>

CSS

/* Start Public Config */
* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

:root {
    --main-color: #2196f3;
    --main-color-alt: #1787e0;
    --main-transition: 0.3s;
    --main-padding: 100px;
    --section-background-color: #ececec;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Cairo", sans-serif;
}

a {
    text-decoration: none;
}

ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.container {
    padding-left: 15px;
    padding-right: 15px;
    margin-left: auto;
    margin-right: auto;
}

@media (min-width: 768px) {
    .container {
        width: 750px;
    }
}

@media (min-width: 992px) {
    .container {
        width: 970px;
    }
}

@media (min-width: 1200px) {
    .container {
        width: 1170px;
    }
}

.main-title {
    margin: 0 auto 100px;
    border: 1px solid black;
    padding: 10px 20px;
    font-size: 30px;
    width: fit-content;
    position: relative;
    z-index: 1;
    transition: var(--main-transition);
}

.main-title::before,
.main-title::after {
    content: "";
    position: absolute;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background-color: var(--main-color);
    top: 50%;
    transform: translateY(-50%);
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    -ms-border-radius: 50%;
    -o-border-radius: 50%;
}

.main-title::before {
    left: -25%;
}

.main-title::after {
    right: -25%;
}

.main-title:hover {
    color: white;
    border: 1px solid white;
    transition-delay: 0.5s;
}

.main-title:hover::before {
    z-index: -1;
    animation: left-move 0.5s linear forwards;
    -webkit-animation: left-move 0.5s linear forwards;
}

.main-title:hover::after {
    z-index: -1;
    animation: right-move 0.5s linear forwards;
    -webkit-animation: right-move 0.5s linear forwards;
}

/* End Public Config */


/* Start Header */

.header {
    background-color: white;
    position: relative;
    box-shadow: 0 0 10px #ddd;
    --main-height: 72px;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    position: relative;
}

.header .container .logo {
    color: var(--main-color);
    font-size: 26px;
    font-weight: bold;
    height: var(--main-height);
    display: flex;
    justify-content: center;
    align-items: center;
}

@media (max-width: 767px) {
    .header .container .logo {
        width: 100%;
        height: 50px;
    }
}

.header .container .main-nav {
    display: flex;
}

@media (max-width: 767px) {
    .header .container .main-nav {
        margin: auto;
    }
}

.header .container .main-nav li:hover .mega-menu {
    opacity: 1;
    top: 100%;
    z-index: 100;
}

.header .container .main-nav>li>a {
    display: flex;
    justify-content: center;
    align-items: center;
    height: var(--main-height);
    position: relative;
    color: black;
    padding: 0 30px;
    transition: var(--main-transition);
    -webkit-transition: var(--main-transition);
    -moz-transition: var(--main-transition);
    -ms-transition: var(--main-transition);
    -o-transition: var(--main-transition);
    overflow: hidden;
}

@media (max-width: 767px) {
    .header .container .main-nav>li>a {
        padding: 10px;
        font-size: 14px;
        height: 40px;
    }
}

.header .container .main-nav>li>a::before {
    content: "";
    position: absolute;
    width: 100%;
    height: 1px;
    background-color: var(--main-color);
    bottom: 0;
    left: -100%;
    transition: var(--main-transition);
    -webkit-transition: var(--main-transition);
    -moz-transition: var(--main-transition);
    -ms-transition: var(--main-transition);
    -o-transition: var(--main-transition);
}

.header .container .main-nav>li>a:hover {
    color: var(--main-color);
    background-color: #fafafa;
}

.header .container .main-nav>li>a:hover::before {
    left: 0;
}

/* Start MegaMenu */

.header .container ul li .mega-menu {
    background-color: white;
    position: absolute;
    width: 100%;
    left: 0;
    padding: 30px;
    border-bottom: 3px solid var(--main-color);
    z-index: -1;
    display: flex;
    gap: 30px;
    top: 200%;
    opacity: 0;
    transition: top var(--main-transition), opacity var(--main-transition);
    -webkit-transition: top var(--main-transition), opacity var(--main-transition);
    -moz-transition: top var(--main-transition), opacity var(--main-transition);
    -ms-transition: top var(--main-transition), opacity var(--main-transition);
    -o-transition: top var(--main-transition), opacity var(--main-transition);
}

@media (max-width: 767px) {
    .header .container ul li .mega-menu {
        flex-direction: column;
        gap: 0;
        padding: 5px;
    }
}

.header .container ul li .mega-menu .image img {
    max-width: 100%;
}

@media (max-width: 991px) {
    .header .container ul li .mega-menu .image {
        display: none;
    }
}

.header .container .main-nav li .mega-menu .links {
    min-width: 250px;
    flex: 1;
}

.header .container .main-nav li .mega-menu .links li {
    position: relative;
}

.header .container .main-nav li .mega-menu .links li:not(:last-child) {
    border-bottom: 1px solid #e9e6e6;
}

@media (max-width: 767px) {
    .header .container .main-nav li .mega-menu .links:first-of-type li:last-child {
        border-bottom: 1px solid #e9e6e6;
    }
}

.header .container .main-nav li .mega-menu .links li::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background-color: #fafafa;
    z-index: -1;
    transition: var(--main-transition);
    -webkit-transition: var(--main-transition);
    -moz-transition: var(--main-transition);
    -ms-transition: var(--main-transition);
    -o-transition: var(--main-transition);
}

.header .container .main-nav li .mega-menu .links li:hover:before {
    width: 100%;
}

.header .container .main-nav li .mega-menu .links li a {
    color: var(--main-color);
    padding: 15px;
    display: block;
    font-size: 18px;
    font-weight: bold;
}

.header .container .main-nav li .mega-menu .links li a i {
    margin-right: 10px;
}

/* End MegaMenu */

/* End Header */

/* Start Landing */

.landing {
    position: relative;
}

.landing::before {
    content: "";
    position: absolute;
    left: 0;
    top: -30px;
    width: 100%;
    height: 100%;
    background-color: #ececec;
    z-index: -1;
    transform-origin: top left;
    transform: skewY(-6deg);
    -webkit-transform: skewY(-6deg);
    -moz-transform: skewY(-6deg);
    -ms-transform: skewY(-6deg);
    -o-transform: skewY(-6deg);
}

.landing .container {
    min-height: calc(100vh - 72px);
    display: flex;
    align-items: center;
    padding-bottom: 120px;
}

@media (max-width: 767px) {
    .landing .container {
        min-height: calc(100vh - 90px);
    }
}

.landing .text {
    flex: 1;
}

@media (max-width: 991px) {
    .landing .text {
        text-align: center;
    }
}

.landing .text h1 {
    font-size: 40px;
    margin: 0;
    letter-spacing: -2px;
}

@media (max-width: 767px) {
    .landing .text h1 {
        font-size: 30px;
    }
}

.landing .text p {
    font-size: 24px;
    line-height: 1.7;
    margin: 5px 0 0;
    color: #666;
    max-width: 500px;
}

@media (max-width: 991px) {
    .landing .text p {
        margin: 10px auto auto;
    }
}

@media (max-width: 767px) {
    .landing .text p {
        font-size: 15px;
    }
}

.landing .image img {
    position: relative;
    width: 600px;
    animation: up-and-down 5s linear infinite;
    -webkit-animation: up-and-down 5s linear infinite;
}

@media (max-width: 991px) {
    .landing .image img {
        display: none;
    }
}

.landing .go-down {
    color: var(--main-color);
    position: absolute;
    bottom: 30px;
    left: 50%;
    transition: var(--main-transition);
    transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
    -webkit-transition: var(--main-transition);
    -moz-transition: var(--main-transition);
    -ms-transition: var(--main-transition);
    -o-transition: var(--main-transition);
}

.landing .go-down i {
    animation: bouncing 1.5s infinite;
    -webkit-animation: bouncing 1.5s infinite;
}

.landing .go-down:hover {
    color: var(--main-color-alt);
}

/* End Landing */

/* Start Article */

.article {
    padding-top: var(--main-padding);
    padding-bottom: var(--main-padding);
}

.article .container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 40px;
}

.article .container .box {
    box-shadow: 0 2px 15px rgb(0 0 0 / 10%);
    background-color: white;
    overflow: hidden;
    border-radius: 5px;
    transition: transform var(--main-transition), box-shadow var(--main-transition);
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    -ms-border-radius: 5px;
    -o-border-radius: 5px;
    -webkit-transition: transform var(--main-transition), box-shadow var(--main-transition);
    -moz-transition: transform var(--main-transition), box-shadow var(--main-transition);
    -ms-transition: transform var(--main-transition), box-shadow var(--main-transition);
    -o-transition: transform var(--main-transition), box-shadow var(--main-transition);
}

.article .container .box:hover {
    transform: translateY(-10px);
    box-shadow: 0 2px 15px rgb(0 0 0 / 20%);
    -webkit-transform: translateY(-10px);
    -moz-transform: translateY(-10px);
    -ms-transform: translateY(-10px);
    -o-transform: translateY(-10px);
}

.article .container .box img {
    max-width: 100%;
}

.article .container .box .content {
    padding: 20px;
}

.article .container .box .content h3 {
    margin: 0;
}

.article .container .box .content p {
    margin: 10px 0 0;
    line-height: 1.5;
    color: #777;
}

.article .container .box .info {
    padding: 20px;
    border-top: 1px solid #e6e6e7;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.article .container .box .info a {
    color: var(--main-color);
    font-weight: bold;
}

.article .container .box .info i {
    color: var(--main-color);
}

.article .container .box:hover .info i {
    animation: arrow-move 0.5s linear infinite;
    -webkit-animation: arrow-move 0.5s linear infinite;
}

/* End Article */

/* Start Gallery */

.gallery {
    padding-top: var(--main-padding);
    padding-bottom: var(--main-padding);
    position: relative;
    background-color: var(--section-background-color);
}

.gallery .container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 40px;
}

.gallery .container .box {
    padding: 15px;
    background-color: white;
    box-shadow: 0px 20px 20px 0px rgb(0 0 0 / 13%), 0px 2px 4px 0px rgb(0 0 0 / 12%);
}

.gallery .container .box .image {
    position: relative;
}

.gallery .container .box .image::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: red;
    width: 10px;
    height: 10px;
    /* opacity: 0; */
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
}

.gallery .container .box img {
    max-width: 100%;
}

/* End Gallery */

/* Start Animation */

@keyframes up-and-down {

    0%,
    100% {
        top: 0;
    }

    50% {
        top: -50px;
    }
}

@keyframes bouncing {

    0%,
    10%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0);
        -webkit-transform: translateY(0);
        -moz-transform: translateY(0);
        -ms-transform: translateY(0);
        -o-transform: translateY(0);
    }

    40%,
    60% {
        transform: translateY(-15px);
        -webkit-transform: translateY(-15px);
        -moz-transform: translateY(-15px);
        -ms-transform: translateY(-15px);
        -o-transform: translateY(-15px);
    }
}

@keyframes left-move {
    50% {
        left: 0;
        width: 15px;
        height: 15px;
    }

    100% {
        width: 50%;
        height: 100%;
        left: 0;
        border-radius: 0;
        -webkit-border-radius: 0;
        -moz-border-radius: 0;
        -ms-border-radius: 0;
        -o-border-radius: 0;
    }
}

@keyframes right-move {
    50% {
        right: 0;
        width: 15px;
        height: 15px;
    }

    100% {
        width: 50%;
        height: 100%;
        right: 0;
        border-radius: 0;
        -webkit-border-radius: 0;
        -moz-border-radius: 0;
        -ms-border-radius: 0;
        -o-border-radius: 0;
    }
}

@keyframes arrow-move {
    100% {
        transform: translateX(10px);
        -webkit-transform: translateX(10px);
        -moz-transform: translateX(10px);
        -ms-transform: translateX(10px);
        -o-transform: translateX(10px);
    }
}

/* End Animation */
html css web frontend
1个回答
0
投票

我发现了这个问题，我必须将 -img- 标签放入 class="image" 的 div 中，并从 -img- 标签中删除 class="image"。

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