.box {
            float: left;
            width: 57.5%;
            /*width: 771px;*/
            height: 420px;
            /*margin: 8px 0 0 0;*/
            background-color: white;
            border-radius: 20px;
            position: relative;
            overflow: hidden;
        }

        .box img {
            display: block;
            width: 100%;
            height: 420px;
            border-radius: 20px;
        }

        .box #ul {
            position: absolute;
            left: 0;
            top: 0;
            list-style: none;
        }

        .box #ul li {
            float: left;
        }
        
        .box .txt {
            display: -webkit-box;
            height: 40px;
            line-height: 40px;
            text-overflow: ellipsis;
            overflow: hidden;
            -webkit-box-orient: vertical;
            -webkit-line-clamp: 1;
            padding: 0 30px;
            font-size: 16px;
            position: absolute;
            left: 0;
            width: 100%;
            bottom: 0;
            border-radius: 0 0 20px 20px;
            background-color: rgba(0, 0, 0, 0.5);
            color: #fff
        }

        .dot {
            position: absolute;
            width: 150px;
            bottom: 10px;
            right: -54px;
            transform: translate(-50%);
        }

        #dotul li {
            margin: 0 5px;
            border-radius: 50%;
            background-color: white;
            font-size: 12px;
            font-family: "microsoft yahei", serif;
            width: 15px;
            height: 15px;
            line-height: 15px;
            display: inline-block;
            cursor: pointer;
            text-align:center;
        }
        
        #dotul .selected {
            background-color: tan;
        }

        #left, #right {
            position: absolute;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            cursor: pointer;
            display: none;
        }

        #left {
            background: url('btn-left.png') no-repeat;
            background-size: 100%;
            left: 10px;
            top: 50%;
            transform: translate(0, -50%);
        }

        #right {
            background: url('btn-right.png') no-repeat;
            background-size: 100%;
            right: 10px;
            top: 50%;
            transform: translate(0, -50%);
        }