css如何修改默认滚动条样式

            &::-webkit-scrollbar {
              // 滚动条的背景
              width: 16px;
              background: #191a37;
              height: 14px;
            }

            &::-webkit-scrollbar-track,
            &::-webkit-scrollbar-thumb {
              border-radius: 999px;
              width: 20px;
              border: 5px solid transparent;
            }

            &::-webkit-scrollbar-track {
              box-shadow: 1px 1px 5px #191a37 inset;
            }

            &::-webkit-scrollbar-thumb {
              //滚动条的滑块样式修改
              width: 20px;
              min-height: 20px;
              background-clip: content-box;
              box-shadow: 0 0 0 5px #464f70 inset;
            }

            &::-webkit-scrollbar-corner {
              background: #191a37;
            }

            &::-webkit-scrollbar {
              width: 6px;
              height: 6px;
              background: transparent;
            }

            &::-webkit-scrollbar-thumb {
              background: transparent;
              border-radius: 4px;
            }

            &:hover::-webkit-scrollbar-thumb {
              background: hsla(0, 0%, 53%, 0.4);
            }

            &:hover::-webkit-scrollbar-track {
              background: hsla(0, 0%, 53%, 0.1);
            }

overflow-x:hidden;