用css3做一个边框hover效果

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Html代码：

<div id="draw-border">
  <button>Hover me</button>
</div>

css样式：

#draw-border {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

button {
  border: 0;
  background: none;
  text-transform: uppercase;
  color: #4361ee;
  font-weight: bold;
  position: relative;
  outline: none;
  padding: 10px 20px;
  box-sizing: border-box;
}

button::before, button::after {
  box-sizing: inherit;
  position: absolute;
  content: '';
  border: 2px solid transparent;
  width: 0;
  height: 0;
}

button::after {
  bottom: 0;
  right: 0;
}

button::before {
  top: 0;
  left: 0;
}

button:hover::before, button:hover::after {
  width: 100%;
  height: 100%;
}

button:hover::before {
  border-top-color: #4361ee;
  border-right-color: #4361ee;
  transition: width 0.3s ease-out, height 0.3s ease-out 0.3s;
}

button:hover::after {
  border-bottom-color: #4361ee;
  border-left-color: #4361ee;
  transition: border-color 0s ease-out 0.6s, width 0.3s ease-out 0.6s, height 0.3s ease-out 1s;
}

效果图： 其它更多css效果可参考下面链接

点我查看更多css hover效果