.cendert {
            width: 380px;
            max-width: 380px;
            overflow-x: scroll;
            display: flex;
            scroll-snap-type: x mandatory;
            border: 1px solid #ccc;
            scroll-behavior: smooth;
            -webkit-overflow-scrolling: touch;
            border-radius: 15px;
            scrollbar-width: none;
            /* Firefox */
            -ms-overflow-style: none;
            /* Internet Explorer and Edge */
        }

        .top1,.top2,.top3 {
            width: 380px;
            flex: none;
            scroll-snap-align: start;
            max-width: 380px;
            height: 240px;
            border-right: 1px solid #ccc;
            font-size: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            background-image: url('img/1.png');
            background-repeat: no-repeat;
            background-size: cover;
        }
        .top2 {
            background-image: url('img/2.jpg');
        }
        .top3 {
            background-image: url('img/3.jpg');
        }

        /* 按钮的css */