.tui-dropdown-box { width: 100%; position: fixed; box-sizing: border-box; border-bottom-right-radius: 24rpx; border-bottom-left-radius: 24rpx; transform: translateZ(0); overflow: hidden; visibility: hidden; transition: all 0.3s ease-in-out; z-index: 998; top:0; } .tui-dropdown-show { visibility: visible; } .tui-dropdown-mask { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0, 0, 0, 0.6); z-index: 996; transition: all 0.3s ease-in-out; opacity: 0; visibility: hidden; } .tui-mask-show { opacity: 1; visibility: visible; }