.demo {
    width: 500px;
    height: 800px;
    overflow: hidden;
    border: 1px dashed #ccc;
    border-radius: 3px;
    margin: auto;

    .sp-lines {
        display: block;
        height: 100%;
        width: 100%;
        overflow: auto;

        ul {
            width: 100%;
            margin: 0;
            padding: 0;
            box-sizing: border-box;

            li {
                padding: 5px 20px;
                box-sizing: border-box;

                width: 100%;
                list-style: none;

                dl {
                    width: 100%;
                    display: flex;
                    justify-content: space-between;

                    dt {
                        img {
                            width: 50px;
                            height: 50px;
                            display: block;
                        }
                    }
                }
            }
        }
    }
}