修改进度条的默认样式

    .upload-container::-webkit-scrollbar {
        width: 4px;
        }
    .upload-container::-webkit-scrollbar-thumb {
        border-radius: 10px;
        -webkit-box-shadow: inset 0 0 5px rgba(0,0,0,0.2);
        background: rgba(0,0,0,0.2);
    }
    .upload-container::-webkit-scrollbar-track {
        -webkit-box-shadow: inset 0 0 5px rgba(0,0,0,0.2);
        border-radius: 0;
        background: rgba(0,0,0,0.1);

    }