html {
    font-family: Microsoft YaHei,Helvetica Neue,Source Sans Pro, -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif !important; /* 1 */
    font-weight:normal;
    font-size: 15px; /* 1 */
    word-spacing: 1px; /* 1 */
    line-height: 20px; /* 2 */
    -ms-text-size-adjust: 100%; /* 3 */
    -webkit-text-size-adjust: 100%; /* 3 */
    -moz-osx-font-smoothing: grayscale; /* 4 */
    -webkit-font-smoothing: antialiased; /* 4 */
    box-sizing: border-box;
    color: #333;
}