1.去除右侧白条

// 去掉el-table表头右侧空白区域
/deep/ .el-table__header{
    width: 100% !important;
}
/deep/ .el-table__body{
    width: 100% !important;
}
/deep/ .el-table th.gutter{
    display: none !important;
    width:0 !important;
}
/deep/ .el-table colgroup col[name='gutter']{
    display: none !important;
    width: 0 !important;
}

修改滚动条样式

// 滚动条的宽度
/deep/ .el-table__body-wrapper::-webkit-scrollbar {
    width: 6px; // 横向滚动条
    height: 6px; // 纵向滚动条 必写
}
// 滚动条的滑块
/deep/ .el-table__body-wrapper::-webkit-scrollbar-thumb {
    background-color: rgb(2, 64, 156);
}
/deep/ .el-table__body-wrapper::-webkit-scrollbar-track {
    background: rgb(8, 35, 96);;
}