/* Mac风格代码窗口 */
pre {
    position: relative;
    padding-top: 38px !important;   /* 给顶部红绿灯留出空间 */
    padding: 16px;
    border-radius: 16px;           /* 调整圆角大小，数值越大圆角越大 */
    overflow: auto;
    box-shadow: 0 6px 22px rgba(0,0,0,0.15); /* 可选：增加窗口阴影，更像mac窗口 */
}

/* 左上角三个圆点红绿灯 */
pre::before{
    content:"";
    position:absolute;
    left:14px;
    top:12px;
    width:12px;
    height:12px;
    border-radius:50%;
    background:#ff5f57;
    box-shadow: 20px 0 0 #ffbd2e, 40px 0 0 #28ca42;
}