<!DOCTYPE html>
<html>
<head>
<style>
.dropbtn {
background-color: #4CAF50;
color: rgb(212, 91, 91);
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
/* 是不移动 可以改成10px试一下看效果 */
right: 50px;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
z-index: 1;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown-content a:hover {
background-color: #f1f1f1;
}
.dropdown:hover .dropdown-content {
display: block;
}
.dropdown:hover .dropbtn {
background-color: #3e8e41;
}
</style>
</head>
<body>
<h1>对齐的下拉内容</h1>
<p>通过 left 和 right 属性，决定下拉内容是左到右还是右到左。</p>
<div class="dropdown" style="float:left;">
<button class="dropbtn">Left</button>
<div class="dropdown-content" style="left:0;">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
<div class="dropdown" style="float:right;">
<button class="dropbtn">Right</button>
<div class="dropdown-content">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
<!-- 理解了吗？明白了吗？ -->
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.fu {
position: relative;
width: 200px;
height: 200px;
background-color: skyblue;
border: 1px solid red;
}
.zi {
position: absolute;
/* 距离左侧距离 */
right: 20px;
/* 距离上侧距离 */
top: 20px;
left: 10px;
width: 50px;
height: 50px;
background-color: red;
}
</style>
</head>
<body>
<!-- 子绝父相 -->
<div class="fu">
<div class="zi">代码</div>
</div>
</body>
</html>
每当你觉得想要批评什么人的时候，你切要记着，这个世界上的人并非都具备你禀有的条件。---《了不起的盖茨比》
看得懂的知识往后看。
标签：16px,dropdown,color,知识,content,w3cschool,background,htmlcss,Link From： https://www.cnblogs.com/effortandluck/p/17034947.html