前端练习（3）- 霓虹按钮

By ikouaneHtml, 前端练习

开发工具：Atom

index.html

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title></title>
    <style media="screen">
body{
  background-color: black;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

a{
  position: relative;
  display: inline-block;
  padding: 15px 30px;
  color: #3296f3;
  text-transform: uppercase;
  letter-spacing: 4px;
  text-decoration: none;
  font-size: 24px;
  overflow: hidden;
  transition: 0.2s;
}

a:hover{
  color: #255784;
  background: #2196f3;
  box-shadow: 0 0 10px #2196f3, 0 0 40px #2196f3, 0 0 80px #2196f3;
  transition-delay: 1s;
}

a span{
  position: absolute;
  display: block;
}

a span:nth-child(1){
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg,transparent,#2196f3);
}

a:hover span:nth-child(1){
  left: 100%;
  transition: 1s;
}

a span:nth-child(3){
  bottom: 0;
  right: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(270deg,transparent,#2196f3);
}

a:hover span:nth-child(3){
  right: 100%;
  transition: 1s;
  transition-delay: 0.5s;
}

a span:nth-child(2){
  top: -100%;
  right: 0;;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg,transparent,#2196f3);
}

a:hover span:nth-child(2){
  top: 100%;
  transition: 1s;
  transition-delay: 0.25s;
}

a span:nth-child(4){
  bottom: -100%;
  left: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(360deg,transparent,#2196f3);
}

a:hover span:nth-child(4){
  bottom: 100%;
  transition: 1s;
  transition-delay: 0.75s;
}

    </style>
  </head>
  <body>
  <a href="#">
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    HELLO
  </a>
  </body>
</html>
教程来自:Online Tutorials(Youtube).
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