简单
代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
div {
width: 200px;
height: 200px;
margin-left: 200px;
border: 1px solid red;
border-radius: 50%;
position: relative;
overflow: hidden;
}
div::before {
content: "";
position: absolute;
top: 100%;
left: 0;
background-color: red;
width: 200px;
height: 200px;
border-radius: 50%;
transition: 0.5s;
}
div:hover:before {
top: 0;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
复杂
代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.container {
width: 1000px;
height: 580px;
margin: 50px auto;
border: 1px solid green;
position: relative;
}
.top {
margin: 0 auto 0px;
padding: 10px 0;
background: deepskyblue;
color: #fff;
}
.dajianshi {
width: 100%;
height: 400px;
position: relative;
}
ul {
display: flex;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
ul li {
list-style: none;
}
ul li span {
width: 120px;
height: 120px;
background-color: #fff;
text-align: center;
line-height: 120px;
margin: 0 10px;
display: block;
border-radius: 50%;
position: relative;
overflow: hidden;
border: 3px solid #cde;
z-index: 1;
}
ul li span:before {
content: "";
position: absolute;
top: 100%;
left: 0;
width: 100%;
height: 100%;
transition: 0.5s;
z-index: 2;
}
ul li span:hover:before {
top: 0;
}
ul li:nth-child(1) span:before {
background: red;
}
ul li:nth-child(2) span:before {
background: orange;
}
ul li:nth-child(3) span:before {
background: yellow;
}
ul li:nth-child(4) span:before {
background: green;
}
</style>
</head>
<body>
<div class="container">
<div class="top">
<h3>球体涨水的效果</h3>
</div>
<div class="dajianshi">
<ul>
<li>
<span></span>
</li>
<li>
<span></span>
</li>
<li>
<span></span>
</li>
<li>
<span></span>
</li>
</ul>
</div>
</div>
</body>
</html>
