编辑汉堡菜单内容的宽度，但保持背景全角

Question

我对编码非常陌生，正在尝试创建一个网站作为练习，但我遇到了麻烦。

我希望我的导航具有全角背景，但内容必须限制为1180px

我尝试使用

width: 1180px;
margin: 0 auto;

我遇到的问题是，这样做包含单击的汉堡菜单背景。

html：

<header class="header">
  <a href="/" class="logo">LOGO</a>
  <input class="menu-btn" type="checkbox" id="menu-btn" />
  <label class="menu-icon" for="menu-btn"><span class="navicon"></span></label>
  <ul class="menu">
    <li><a href="#work">Work</a></li>
    <li><a href="#about">About</a></li>
    <li><a href="#contact">Contact</a></li>
  </ul>
</header>

css：

.header {
  background-color: #fff;
  position: fixed;
  width: 100%;
  z-index: 3;
}

.header ul {
  margin: 0;
  padding: 0;
  list-style: none;
  overflow: hidden;
  background-color: #1a1a1a;
}

.header li a {
  display: inline-block;
  padding: 20px 20px;
  text-decoration: none;
  color: #B3B3B3;
}

.header li a:hover {
  color: #fff;
}

.header .logo {
  display: block;
  float: left;
  font-size: 2em;
  padding: 10px 20px;
  text-decoration: none;
}

.header .menu {
  clear: both;
  max-height: 0;
  transition: max-height .2s ease-out;
}

.header .menu-icon {
  cursor: pointer;
  display: inline-block;
  float: right;
  padding: 28px 20px;
  position: relative;
  user-select: none;
}

.header .menu-icon .navicon {
  background: #333;
  display: block;
  height: 2px;
  position: relative;
  transition: background .2s ease-out;
  width: 18px;
}

.header .menu-icon .navicon:before,
.header .menu-icon .navicon:after {
  background: #333;
  content: '';
  display: block;
  height: 100%;
  position: absolute;
  transition: all .2s ease-out;
  width: 100%;
}

.header .menu-icon .navicon:before {
  top: 5px;
}

.header .menu-icon .navicon:after {
  top: -5px;
}

.header .menu-btn {
  display: none;
}

.header .menu-btn:checked ~ .menu {
  max-height: 240px;
}

.header .menu-btn:checked ~ .menu-icon .navicon {
  background: transparent;
}

.header .menu-btn:checked ~ .menu-icon .navicon:before {
  transform: rotate(-45deg);
}

.header .menu-btn:checked ~ .menu-icon .navicon:after {
  transform: rotate(45deg);
}

.header .menu-btn:checked ~ .menu-icon:not(.steps) .navicon:before,
.header .menu-btn:checked ~ .menu-icon:not(.steps) .navicon:after {
  top: 0;
}

https://codepen.io/zwirled/pen/PoPjxym

任何帮助将不胜感激！

谢谢

Answer 1

编辑2：在html中添加了<nav class="nav">，标题为9vh，宽度为1080px。虽然在px中的标头上使用固定宽度不会使标头响应。考虑使用％。

body {
  margin: 0;
  font-family: "Signika";
  background-color: #1DD8C5;
}

a {
  color: #1a1a1a;
}


/* header */

.header {
  background-color: #fff;
  position: fixed;
  width: 1080px;
  z-index: 3;
  height:9vh;
}
.nav{
  width:1080px;
}
.header ul {
  margin: 0;
  padding: 0;
  list-style: none;
  overflow: hidden;
  background-color: #1a1a1a;
}

.header li a {
  display: inline-block;
  padding: 20px 20px;
  text-decoration: none;
  color: #B3B3B3;
}

.header li a:hover {
  color: #fff;
}

.header .logo {
  display: block;
  float: left;
  font-size: 2em;
  padding: 10px 20px;
  text-decoration: none;
}

/* menu */

.header .menu {
  clear: both;
  max-height: 0;
  display:flex;
  flex-direction:column;
  transition: max-height .2s ease-out;
}



/* menu icon */

.header .menu-icon {
  cursor: pointer;
  display: inline-block;
  float: right;
  padding: 28px 20px;
  position: relative;
  user-select: none;
}

.header .menu-icon .navicon {
  background: #333;
  display: block;
  height: 2px;
  position: relative;
  transition: background .2s ease-out;
  width: 18px;
}

.header .menu-icon .navicon:before,
.header .menu-icon .navicon:after {
  background: #333;
  content: '';
  display: block;
  height: 100%;
  position: absolute;
  transition: all .2s ease-out;
  width: 100%;
}

.header .menu-icon .navicon:before {
  top: 5px;
}

.header .menu-icon .navicon:after {
  top: -5px;
}

/* menu btn */

.header .menu-btn {
  display: none;
}

.header .menu-btn:checked ~ .menu {
  max-height: 240px;
}

.header .menu-btn:checked ~ .menu-icon .navicon {
  background: transparent;
}

.header .menu-btn:checked ~ .menu-icon .navicon:before {
  transform: rotate(-45deg);
}

.header .menu-btn:checked ~ .menu-icon .navicon:after {
  transform: rotate(45deg);
}

.header .menu-btn:checked ~ .menu-icon:not(.steps) .navicon:before,
.header .menu-btn:checked ~ .menu-icon:not(.steps) .navicon:after {
  top: 0;
}

<header class="header">
  <nav class="nav">
  <a href="/" class="logo">LOGO</a>
  <input class="menu-btn" type="checkbox" id="menu-btn" />
  <label class="menu-icon" for="menu-btn"><span class="navicon"></span></label>
     <ul class="menu">
    <li><a href="#work">Work</a></li>
    <li><a href="#about">About</a></li>
    <li><a href="#contact">Contact</a></li>
  </ul>
    <nav>
  
</header>