/* 屏幕尺寸小于等于 767px 时执行的样式 */
@media only screen and (max-width: 767px) {
    .guanyu-xs { width:  100%; }
    .us-nav { display: none; }
    .us-con-xs { width: 100%; }
}

/* 屏幕尺寸大于等于 768px 时执行的样式 */
@media only screen and (min-width: 768px) {
    .guanyu-sm { width:  1200px; }
    .usbox {
        display: grid;
        grid-template-columns: 200px 970px;
        column-gap: 30px;
    }
    .us-con-sm { background-color: #fff; border-radius: 3px; margin-top: 30px; }
}
.guanyu { background: #F6F7F9; padding-bottom: 30px; }
.us-nav { margin-top: 20px; }
.us-nav p { height: 60px; line-height: 60px; border-bottom: 1px solid rgba(0, 0, 0, 0.10); }
.us-con { padding: 15px; }
.con-box-us { line-height: 30px; margin-top: 20px; }
.con-box-us img { max-width: 100%; }
.con-box-us p { text-indent: 2em; margin-top: 20px; }