鼠标hover时，下划线从中间向两侧运动

鼠标hover时，下划线从中间向两侧运动

CSS实现：

/* Underline From Center */
.te-underline-from-center {
    display: inline-block;
    vertical-align: middle;
    -webkit-transform: perspective(1px) translateZ(0);
    transform: perspective(1px) translateZ(0);
    box-shadow: 0 0 1px rgba(0, 0, 0, 0);
    position: relative;
    overflow: hidden;
  }
.te-underline-from-center:before {
    content: "";
    position: absolute;
    z-index: -1;
    left: 51%;
    right: 51%;
    bottom: 0;
    background: #2563eb;
    height: 3px;
    -webkit-transition-property: left, right;
    transition-property: left, right;
    -webkit-transition-duration: 0.3s;
    transition-duration: 0.3s;
    -webkit-transition-timing-function: ease-out;
    transition-timing-function: ease-out;
  }
.te-underline-from-center:hover:before, .te-underline-from-center:focus:before, .te-underline-from-center:active:before {
    left: 0;
    right: 0;
  }

参考资料：

• HOVER.CSS