效果
源码
index.html
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Icon Fill Hover Effects</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN" crossorigin="anonymous">
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body><ul><li style="--clr:#1da1f2"><i class="fa fa-twitter"></i></li><li style="--clr:#dd2a7b"
