/* Products 下拉：右侧二级栏目面板默认最高 550px，超出在框内滚动 */
#nav_sec_2 .nav_third_box{
  max-height:min(550px, calc(100vh - 140px)) !important;
  overflow-y:auto !important;
  overflow-x:hidden !important;
  overscroll-behavior:contain;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:thin;
  scrollbar-color:rgba(0,0,0,.28) #ffffff;
}
#nav_sec_2 .nav_third_box::-webkit-scrollbar{width:6px;background:#ffffff;border-radius:6px}
#nav_sec_2 .nav_third_box::-webkit-scrollbar-track{background:#ffffff;border-radius:6px}
#nav_sec_2 .nav_third_box::-webkit-scrollbar-thumb{background:rgba(0,0,0,.24);border-radius:6px}
#nav_sec_2 .nav_third_box::-webkit-scrollbar-thumb:hover{background:rgba(0,0,0,.42)}