* {
  padding: 0;margin: 0;
}
section {
  background-color: pink;
}
section ul li {
  line-height: 50px;
}
.menu__link {     //a标签样式
    font-size: 1.05em;
    font-weight: bold;
    display: block;
    padding: 1em;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
    -khtml-user-select: none;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}
.menu--alonso .menu__line {  //下划线样式
    position: absolute;
    top: 100%;
    left: 0;
    width: 60px;
    height: 2px;
    pointer-events: none;
    border: 1px solid #fff;
    border-width: 0 47px;
    background: #d94f5c;
    -webkit-transition: -webkit-transform 0.5s;
    transition: transform 0.5s;
    -webkit-transition-timing-function: cubic-bezier(1, 0.01, 0, 1);
    -webkit-transition-timing-function: cubic-bezier(1, 0.01, 0, 1.22);
    transition-timing-function: cubic-bezier(1, 0.01, 0, 1.22);
}