按钮上下边水平伸缩css html源码

演示

源码

html

[lv]

<div class="btn-animate btn-animate-1">
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</div>

[/lv]

css

[lv]

.btn-animate {
  position: relative;
  width: 130px;
  height: 40px;
  line-height: 40px;
  border: none;
  border-radius: 5px;
  background: #027efb;
  color: #fff;
  text-align: center;
}

.btn-animate-1 {

  &::before, &::after {
    content: '';
    position: absolute;
    height: 2px;
    width: 0;
    background: #027efb;
    transition: all .6s ease;
  }

  &::before {
    top: 0;
    right: 0;
  }

  &::after {
    left: 0;
    bottom: 0;
  }

  &:hover {
    color: #027efb;
    background: transparent;

    &::before, &::after {
      width: 100%;
    }
  }
}

[/lv]