CSS按钮边框悬停动画效果

CSS 按钮边框悬停动画效果。

HTML 代码：

<div >
  <button ><span>Hover Me</span></button>
  <button ><span>Hover Me</span></button>
  <button ><span>Hover Me</span></button>
  <button ><span>Hover Me</span></button>
  <button ><span>Hover Me</span></button>
  <button ><span>Hover Me</span></button>
</div>

CSS 代码：

@import url(https://fonts.googleapis.com/css?family=PT+Sans);
*, *:after, *:before {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
body{
  font-family: 'PT Sans', sans-serif;
  display: table;
  width: 100%;
  background: #f54785;overflow: hidden
}
.container{
  display: table-cell;
  vertical-align: middle;
  text-align: center;
  height: 100vh;
}
button{
  display: inline-block;
  position: relative;
  background: none;
  border: none;
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  margin: 20px 30px;
  background: rgba(0,0,0,0.09);
}
span{
  display: block;
  padding: 25px 80px;
}
button::before, button::after{
  content:"";
  width: 0;
  height: 2px;
  position: absolute;
  transition: all 0.2s linear;
  background: #fff;
}

span::before, span::after{
  content:"";
  width:2px;
  height:0;
  position: absolute;
  transition: all 0.2s linear;
  background: #fff;
}
button:hover::before, button:hover::after{
  width: 100%;
}
button:hover span::before, button:hover span::after{
  height: 100%;
}
/*----- button 1 -----*/
.btn-1::before, .btn-1::after{
  transition-delay: 0.2s;
}
.btn-1 span::before, .btn-1 span::after{
  transition-delay: 0s;
}
.btn-1::before{
  right: 0;
  top: 0;
}
.btn-1::after{
  left: 0;
  bottom: 0;
}
.btn-1 span::before{
  left: 0;
  top: 0;
}
.btn-1 span::after{
  right: 0;
  bottom: 0;
}
.btn-1:hover::before, .btn-1:hover::after{
  transition-delay: 0s;
}
.btn-1:hover span::before, .btn-1:hover span::after{
  transition-delay: 0.2s;
}

/*--- Button 2 -------*/


.btn-2::before, .btn-2::after{
  transition-delay: 0s;
}
.btn-2 span::before, .btn-2 span::after{
  transition-delay: 0.2s;
}
.btn-2::before{
  right: 0;
  top: 0;
}
.btn-2::after{
  left: 0;
  bottom: 0;
}
.btn-2 span::before{
  left: 0;
  top: 0;
}
.btn-2 span::after{
  right: 0;
  bottom: 0;
}
.btn-2:hover::before, .btn-2:hover::after{
  transition-delay: 0.2s;
}
.btn-2:hover span::before, .btn-2:hover span::after{
  transition-delay: 0s;
}


/*----- button 3 -----*/
.btn-3::after{
  left: 0;
  bottom: 0;
  transition-delay: 0.6s;
}
.btn-3 span::after{
  transition-delay: 0.4s;
  right: 0;
  bottom: 0
}
.btn-3::before{
  right: 0;
  top: 0;
  transition-delay: 0.2s;
}
.btn-3 span::before{
  transition-delay: 0s;
  left: 0;
  top: 0;
}

.btn-3:hover::after{
  transition-delay: 0s;
}
.btn-3:hover span::after{
  transition-delay: 0.2s;
}
.btn-3:hover::before{
  transition-delay: 0.4s;
}
.btn-3:hover span::before{
  transition-delay: 0.6s;
}

/*----- button 4 -----*/
.btn-4::after{
  right:0;
  bottom: 0;
  transition-duration: 0.4s;
}
.btn-4 span::after{
  right:0;
  bottom: 0;
  transition-duration: 0.4s;
}
.btn-4::before{
  left: 0;
  top: 0;
  transition-duration: 0.4s;
}
.btn-4 span::before{
  left: 0;
  top: 0;
  transition-duration: 0.4s;
}

/*----- button 5 -----*/
.btn-5::after{
  left:0;
  bottom: 0;
  transition-duration: 0.4s;
}
.btn-5 span::after{
  right:0;
  top: 0;
  transition-duration: 0.4s;
}
.btn-5::before{
  right: 0;
  top: 0;
  transition-duration: 0.4s;
}
.btn-5 span::before{
  left: 0;
  bottom: 0;
  transition-duration: 0.4s;
}

/*----- button 6 -----*/
.btn-6::before{
  left: 50%;
  top: 0;
  transition-duration: 0.4s;
}
.btn-6::after{
  left: 50%;
  bottom: 0;
  transition-duration: 0.4s;
}
.btn-6 span::before{
  left: 0;
  top: 50%;
  transition-duration: 0.4s;
}
.btn-6 span::after{
  right: 0;
  top: 50%;
  transition-duration: 0.4s;
}
.btn-6:hover::before, .btn-6:hover::after{
  left: 0;
}
.btn-6:hover span::before, .btn-6:hover span::after{
  top: 0;
}

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