我希望左侧边框为 4px 厚的粉红色,其他地方为 1px 灰色:
border: 1px solid #E5E5E5;
border-left: 4px solid #F24495;
问题是连接是对角线的,所以我得到了可怕的覆盖。我试过:
.item:before{
border-left: 4px solid #F24495;
}
但运气不佳。
.item::before
是正确的方法,但它需要在单个 border-left
属性之外进行一些工作。您需要使伪元素可见 (display: block; content: "";
),将伪元素放置在 .item
的左侧,然后将其拉伸以与顶部和底部边框正确对齐。
虽然这可以手动完成,但我强烈建议使用CSS Variables(或预处理器中的variables),因为它使得更新边框宽度更不容易出错和痛苦。
.item {
display: inline-block;
padding: 0.2em 0.3em;
background: #f8f8f8;
color: #454545;
/* Set border widths with variables */
--top-border-width: 4px;
--bottom-border-width: var(--top-border-width);
--left-border-width: 16px;
--right-border-width: var(--top-border-width);
/* Set border styles for each side */
border-top: var(--top-border-width) solid #e4e4e4;
border-bottom: var(--bottom-border-width) solid #e4e4e4;
border-right: var(--right-border-width) solid #e4e4e4;
/* Remove the left border and add blank space where the border should be placed */
border-left: 0;
margin-left: var(--left-border-width);
/* Contain the ::before */
position: relative;
}
.item::before {
/* Give the pseudo element substance */
display: block;
content: "";
/* Add a left border with a straight edge */
border-left: var(--left-border-width) solid #f84995;
/* Position pseudo element's border where the normal border would have been placed */
position: absolute;
top: calc(0px - var(--top-border-width));
bottom: calc(0px - var(--bottom-border-width));
left: calc(0px - var(--left-border-width));
}
<h1 class="item">Gen.2</h1>
如果您想使用
:before
伪选择器,您还需要设置一些内容。请参阅示例 this jsfiddle 以及以下示例代码:
<div>Container</div>
CSS:
div {
border: 10px solid black;
border-left-width: 0;
}
div::before {
border: 10px solid orange;
border-right-width: 0;
content: '';
}
显示为:
编辑
嗯,虽然这应该严格回答问题,但在尝试将我的解决方案适应问题的小提琴时,我发现这与填充效果不太好。接受可以处理这一点的建议/编辑/其他答案:(...
这应该可行,但需要额外的标记:
.outer {
border: 1px solid #E5E5E5;
border-left: 0;
}
.inner {
border-left: 4px solid #F24495;
}
和
<div class="outer">
<div class="inner">
...
</div>
</div>
默认情况下,CSS 对所有边框关节使用 miter Joints(45° 角)。因此,要为任何边框实现方形接头(90°角),您可以使用(1)内部box-shadow,(2)pseudo-elements或(3)background-image和多个线性-渐变。
假设您有以下想要设置样式的元素:
<div></div>
box-shadow
div {
/* downside of using box-shadow, you need to add the */
/* inner border size to the padding on top of any */
/* additional padding you might want */
padding: 20px;
/* by changing the order of your box-shadows, you */
/* can modify which borders overlap each other */
box-shadow:
/* left "inner border" */
inset 20px 0 0 0 red,
/* right "inner border" */
inset -20px 0 0 0 grey,
/* top "inner border" */
inset 0 20px 0 0 grey,
/* bottom "inner border" */
inset 0 -20px 0 0 grey;
}
pseudo-elements
div {
border: 20px solid grey;
}
div::before {
position: absolute;
background-color: red;
content: "";
width: 20px;
/* we need to add the height of the top and bottom */
/* border to the pseudo-elements' height as the */
/* inset border is not included in the height of the */
/* div even when "box-sizing: border-box" is set. */
height: calc(100% + 20px + 20px);
top: -20px;
left: -20px;
}
background-image
和多个 linear-gradients
div {
/* downside of using multiple linear-gradients, you */
/* need to add the inner border size to the padding */
/* on top of any additional padding you might want */
padding: calc(20px + 10px);
background-image:
/* left "inner border" */
linear-gradient(to right, red 20px, transparent 20px),
/* right "inner border" */
linear-gradient(to left, grey 20px, transparent 20px),
/* top "inner border" */
linear-gradient(grey 20px, transparent 20px),
/* bottom "inner border" */
linear-gradient(to top, grey 20px, transparent 20px);
}
包装两个元素并使用 border-width 属性的组合对我来说效果很好。请注意,当您也使用边框半径时,您将必须取消设置受影响的边。
我将其包含在我的示例中,因为 border-radius 与边框一起使用非常常见。
<div class="outer">
<div class="inner">
Here ives some text
</div>
</div>
.outer {
margin: 10px;
border-left: solid lightblue;
border-radius: 3px;
border-width: 0 0 0 8px;
margin-bottom: 16px;
}
.inner {
border: 7px solid grey;
border-bottom-right-radius: 3px;
border-top-right-radius: 3px;
border-left: 0;
padding: 16px;
}