a {

    text-decoration: none;//去掉下划线

    color: inherit;

    -webkit-user-select: none;

    -moz-user-select: none;

    user-select: none;

    -webkit-appearance: none;

    -webkit-text-size-adjust: none;

    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);

    -webkit-touch-callout: none;

    border-bottom: none;//去掉下边框（用text-decoration: none;没有用是时候加上）；

    display: block;

    width: 100%;

    height: 40px;

}