文字渐变：
HTML:
<h2 class="text-gradient">ABC</h2>
CSS:
.text-gradient{
font-size: 10em;
dipslay: inline-block;
background-image: -webkit-gradient(linear,0 0,0 bottom,from(rgba(0, 128, 0, 1)),to(rgba(51, 51, 51, 1)));
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
}