CSS边框 | 清水

：最近发现有小伙伴对我博客里面边框的样式挺好奇，这里专门写一篇博客给大家讲一下这个样式,废话不多说上效果

draw

meet

center

在这里就分布介绍一下三种边框的样式：

在此之前咱们需要给div（你也可以用其他标签，这里我就用div举例子了）添加上通用样式

<body>
	<div class='draw'>
		draw
	</div>
	<div class='draw meet'>
		meet
	</div>
	<div class='center'>
		center
	</div>
</body>

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div {
  background: none;
  border: 0;
  box-sizing: border-box;
  margin: 1em;
  padding: 1em 1em;
  box-shadow: inset 0 0 0 2px #f45e61;
  color: #f45e61;
  font-size: 15px;
  font-weight: 700;
  position: relative;
  vertical-align: middle;
  text-align: center;
  width:100px;
  height:50px;
  line-height: 20px;
}
div::before, div::after {
  box-sizing: inherit;
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
}

div {
  transition: color 0.25s;
}
div::before, div::after {
  border: 2px solid transparent;
  width: 0;
  height: 0;
}

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# 1.第一种单向变色

.draw::before {
  top: 0;
  left: 0;
}
.draw::after {
  bottom: 0;
  right: 0;
}
.draw:hover {
  color: #60daaa;
}
.draw:hover::before, .draw:hover::after {
  width: 100%;
  height: 100%;
}
.draw:hover::before {
  border-top-color: #60daaa;
  border-right-color: #60daaa;
  transition: width 0.25s ease-out, height 0.25s ease-out 0.25s;
}
.draw:hover::after {
  border-bottom-color: #60daaa;
  border-left-color: #60daaa;
  transition: border-color 0s ease-out 0.5s, width 0.25s ease-out 0.5s, height 0.25s ease-out 0.75s;
}

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# 2.第二种双向渐变色

.meet:hover {
  color: #fbca67;
}
.meet::after {
  top: 0;
  left: 0;
}
.meet:hover::before {
  border-top-color: #fbca67;
  border-right-color: #fbca67;
}
.meet:hover::after {
  border-bottom-color: #fbca67;
  border-left-color: #fbca67;
  transition: height 0.25s ease-out, width 0.25s ease-out 0.25s;
}

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# 3.第三种中心展开变色

.center:hover {
  color: #6477b9;
}
.center::before, .center::after {
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  -webkit-transform-origin: center;
          transform-origin: center;
}
.center::before {
  border-top: 2px solid #6477b9;
  border-bottom: 2px solid #6477b9;
  -webkit-transform: scale3d(0, 1, 1);
          transform: scale3d(0, 1, 1);
}
.center::after {
  border-left: 2px solid #6477b9;
  border-right: 2px solid #6477b9;
  -webkit-transform: scale3d(1, 0, 1);
          transform: scale3d(1, 0, 1);
}
.center:hover::before, .center:hover::after {
  -webkit-transform: scale3d(1, 1, 1);
          transform: scale3d(1, 1, 1);
  transition: transform 0.5s, -webkit-transform 0.5s;
}

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