小贝子编程

将导航栏按钮填充到容器的宽度



我正在尝试用HTML&只有CSS，我遇到了一个问题，我无法将按钮填充到container的长度。我试着使用flexbox，但不知怎么的没用。这是代码：

body {
background-color: #D4D4D4;
font-family: Arial, Helvetica, sans-serif;
font-size: 14px;
line-height: 26px;
color: #666;
margin: 0;
}
.reset {
clear: both;
}
.navigation {
list-style: none;
padding: 0;
margin: 0;
background-color: rgb(58, 58, 58);
border-top: 3px solid #FFF;
box-shadow: 0px 11px 21px 0px rgba(0,0,0,0.59);
}
.navigation li {
float: left;
}
.navigation li:hover {
background-color: #222;
}
.navigation li:first-child {
border-radius: 5px 5px 0 0;
-webkit-border-radius: 5px 5px 0 0;
-moz-border-radius: 5px 5px 0 0;
-ms-border-radius: 5px 5px 0 0;
-o-border-radius: 5px 5px 0 0;
}
.navigation li a {
display: block;
padding: 0 20px;
text-decoration: none;
line-height: 40px;
color: #FFF;
}
.navigation ul {
display: none;
position: absolute;
list-style: none;
margin-left: -3px;
padding: 0;
overflow: hidden;
}
.navigation ul li {
float: none;
}
.navigation li:hover > ul li:hover {
border-radius: 0 0 5px 5px;
-webkit-border-radius: 0 0 5px 5px;
-moz-border-radius: 0 0 5px 5px;
-ms-border-radius: 0 0 5px 5px;
-o-border-radius: 0 0 5px 5px;
}
.navigation li li a:hover {
background-color: #000;
}
.navigation ul li:last-child a,
.navigation ul li:last-child a:hover {
border-radius: 0 0 5px 5px;
-webkit-border-radius: 0 0 5px 5px;
-moz-border-radius: 0 0 5px 5px;
-ms-border-radius: 0 0 5px 5px;
-o-border-radius: 0 0 5px 5px;
}
.navigation li:hover {
border-bottom: 2px solid dodgerblue;
}
.navigation li {
border-bottom: 2px solid transparent;
}
@media screen and (min-width: 1281px) {
.submenu::after {
content: " +";
}

.navigation li:hover .submenu::after {
content: " –";
}
.navigation li:hover > ul {
display: block;
background-color: #222;
border: 3px solid #FFF;
border-top: 0;
border-radius: 0 0 8px 8px;
-webkit-border-radius: 0 0 8px 8px;
-moz-border-radius: 0 0 8px 8px;
-ms-border-radius: 0 0 8px 8px;
-o-border-radius: 0 0 8px 8px;
box-shadow: 0px 3px 3px 0px rgba(0, 0, 0, 0.25);
}
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="./css/navbar.css">
<title>My Website</title>
</head>
<body>
<div id="container">
<!-- HEADER -->
<header>
<ul class="navigation">
<li><a href="./index.html">HOME</a></li>
<li><a class="submenu" href="#">DROPDOWN 1</a>
<ul>
<li><a href="#">PLACEHOLDER 1</a></li>
<li><a href="#">PLACEHOLDER 2</a></li>
<li><a href="#">PLACEHOLDER 3</a></li>
</ul>
</li>
<li><a class="submenu" href="#">DROPDOWN 2</a>
<ul>
<li><a href="#">PLACEHOLDER 1</a></li>
<li><a href="#">PLACEHOLDER 2</a></li>
<li><a href="#">PLACEHOLDER 3</a></li>
</ul>
</li>
<li><a href="#">LINK 1</a></li>
<li><a href="#">LINK 2</a></li>
<li><a href="#">LINK 3</a></li>
<div class="reset"></div>
</ul>
</header>
</div>
</body>
</html>

试试这个代码：

body {
background-color: #D4D4D4;
font-family: Arial, Helvetica, sans-serif;
font-size: 14px;
line-height: 26px;
color: #666;
margin: 0;
}
.reset {
clear: both;
}
.navigation {
list-style: none;
padding: 0;
margin: 0;
background-color: rgb(58, 58, 58);
border-top: 3px solid #FFF;
box-shadow: 0px 11px 21px 0px rgba(0,0,0,0.59);
display: flex;
}
.navigation li {
flex: 1 0 auto;
}
.navigation li:hover {
background-color: #222;
}
.navigation li:first-child {
border-radius: 5px 5px 0 0;
-webkit-border-radius: 5px 5px 0 0;
-moz-border-radius: 5px 5px 0 0;
-ms-border-radius: 5px 5px 0 0;
-o-border-radius: 5px 5px 0 0;
}
.navigation li a {
display: block;
padding: 0 5px;
text-decoration: none;
line-height: 40px;
color: #FFF;
}
.navigation ul {
display: none;
position: absolute;
list-style: none;
margin-left: -3px;
padding: 0;
overflow: hidden;
}
.navigation ul li {
float: none;
}
.navigation li:hover > ul li:hover {
border-radius: 0 0 5px 5px;
-webkit-border-radius: 0 0 5px 5px;
-moz-border-radius: 0 0 5px 5px;
-ms-border-radius: 0 0 5px 5px;
-o-border-radius: 0 0 5px 5px;
}
.navigation li li a:hover {
background-color: #000;
}
.navigation ul li:last-child a,
.navigation ul li:last-child a:hover {
border-radius: 0 0 5px 5px;
-webkit-border-radius: 0 0 5px 5px;
-moz-border-radius: 0 0 5px 5px;
-ms-border-radius: 0 0 5px 5px;
-o-border-radius: 0 0 5px 5px;
}
.navigation li:hover {
border-bottom: 2px solid dodgerblue;
}
.navigation li {
border-bottom: 2px solid transparent;
}
@media screen and (min-width: 1281px) {
.submenu::after {
content: " +";
}
.navigation li:hover .submenu::after {
content: " –";
}
.navigation li:hover > ul {
display: block;
background-color: #222;
border: 3px solid #FFF;
border-top: 0;
border-radius: 0 0 8px 8px;
-webkit-border-radius: 0 0 8px 8px;
-moz-border-radius: 0 0 8px 8px;
-ms-border-radius: 0 0 8px 8px;
-o-border-radius: 0 0 8px 8px;
box-shadow: 0px 3px 3px 0px rgba(0, 0, 0, 0.25);
}
}
<div id="container">
<!-- HEADER -->
<header>
<ul class="navigation">
<li><a href="./index.html">HOME</a></li>
<li><a class="submenu" href="#">DROPDOWN 1</a>
<ul>
<li><a href="#">PLACEHOLDER 1</a></li>
<li><a href="#">PLACEHOLDER 2</a></li>
<li><a href="#">PLACEHOLDER 3</a></li>
</ul>
</li>
<li><a class="submenu" href="#">DROPDOWN 2</a>
<ul>
<li><a href="#">PLACEHOLDER 1</a></li>
<li><a href="#">PLACEHOLDER 2</a></li>
<li><a href="#">PLACEHOLDER 3</a></li>
</ul>
</li>
<li><a href="#">LINK 1</a></li>
<li><a href="#">LINK 2</a></li>
<li><a href="#">LINK 3</a></li>
<div class="reset"></div>
</ul>
</header>
</div>

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