HTML5+CSS3 做一个鼠标悬停按钮发光效果，代码简单，没什么难点。
效果：
源码：
<!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>鼠标悬停按钮发光</title>
<link rel="stylesheet" href="./1.css">
</head>
<body>
<span>button</span>
<span>button</span>
<span>button</span>
<span>button</span>
</body>
</html>css:
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html,body {
display: flex;
justify-content: center;
align-items: center;
min-height: 100%;
background: #000;
}
span {
position: relative;
margin: 40px;
padding: 10px;
color: #21ebff;
/* 标准文本 */
text-decoration: none;
/* 文本单词大写 */
text-transform: uppercase;
letter-spacing: 2px;
font-size: 20px;
transition: .5s;
overflow: hidden;
}
span::before {
content: '';
position: absolute;
top: 0;
left: 0;
width: 14px;
height: 14px;
border-left: 2px solid #21ebff;
border-top: 2px solid #21ebff;
transition: .5s;
}
span::after {
content: '';
position: absolute;
bottom: 0;
right: 0;
width: 14px;
height: 14px;
border-bottom: 2px solid #21ebff;
border-right: 2px solid #21ebff;
transition: .5s;
}
span:hover::after {
width: 100%;
height: 100%;
}
span:hover::before {
width: 100%;
height: 100%;
}
span:hover {
background: #21ebff;
color: #fff;
box-shadow: 0 0 40px #21ebff;
transition-delay: .3s;
-webkit-box-reflect: below 0 linear-gradient(transparent,rgba(0 0 0 .4));
}
span:nth-child(1) {
filter: hue-rotate(100deg);
}
span:nth-child(2) {
filter: hue-rotate(180deg);
}
span:nth-child(3) {
filter: hue-rotate(300deg);
}