message: Fix scroll bar in bem theme
diff: -.sv-main ::-webkit-scrollbar {
  +.sv-root-bem ::-webkit-scrollbar {
  height: 6px;
  width: 6px;
  background-color: $main-hover-color;
  }
  -.sv-main ::-webkit-scrollbar-thumb {
  +.sv-root-bem ::-webkit-scrollbar-thumb {
  background: $main-color;
  }
  