通过 css3 自定义、修改滚动条的样式

    ::-webkit-scrollbar {
        width: 4px !important;
        background-color: #012d58 !important;
        border-radius: 4px !important;
    }
    ::-webkit-scrollbar-thumb {
        border-radius: 4px !important;
        background-image: linear-gradient(rgba(122, 153, 217, 0.44), rgba(73, 125, 189, 0.72), rgba(28, 58, 148, 0.86)) !important;
    }
    ::-webkit-scrollbar-track {
        background-color: #012d58 !important;
        border-radius: 4px !important;
    }