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<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>css3渐变动画</title> <style> *{ margin: 0; padding: 0; } .hover{ position: relative; display: block; float: left; margin-right: 20px; width: 200px; height: 120px; z-index: 1; } .hover:after{ position: absolute; display: block; content: ''; width: 100%; height: 100%; top: 0; left: 0; -webkit-transition: opacity 0.5s ease-out; -moz-transition: opacity 0.5s ease-out; -ms-transition: opacity 0.5s ease-out; transition: opacity 0.5s ease-out; opacity: 0; z-index: 2; } .hover:hover:after{ opacity: 1; } .hover-a{ background: #00dafe\9; background: -webkit-linear-gradient(left, #00dafe, #3381ff); background: -moz-linear-gradient(left, #00dafe, #3381ff); background: -ms-linear-gradient(left, #00dafe, #3381ff); background: linear-gradient(left, #00dafe, #3381ff); } .hover-a:after{ background: -webkit-linear-gradient(right, #00dafe, #3381ff); background: -moz-linear-gradient(right, #00dafe, #3381ff); background: -ms-linear-gradient(right, #00dafe, #3381ff); background: linear-gradient(right, #00dafe, #3381ff); } .hover-b{ background: #ea73ff\9; background: -webkit-linear-gradient(left, #ea73ff, #a34eff); background: -moz-linear-gradient(left, #ea73ff, #a34eff); background: -ms-linear-gradient(left, #ea73ff, #a34eff); background: linear-gradient(left, #ea73ff, #a34eff); } .hover-b:after{ background: -webkit-linear-gradient(right, #ea73ff, #a34eff); background: -moz-linear-gradient(right, #ea73ff, #a34eff); background: -ms-linear-gradient(right, #ea73ff, #a34eff); background: linear-gradient(right, #ea73ff, #a34eff); } </style></head><body><a href="" class="hover hover-a"></a><a href="" class="hover hover-b"></a></body></html>