tutu/src/material/Scaffold.css

.Scaffold>.topbar {
  position: sticky;
  top: 0px;
  z-index: var(--tutu-zidx-nav, auto);

  .MuiToolbar-root {
    margin-left: var(--safe-area-inset-left);
    margin-right: var(--safe-area-inset-right);

    >.MuiButtonBase-root {
      &:first-child {
        margin-left: -0.5em;
        margin-right: 24px;
      }

      &:last-child {
        margin-right: -0.5em;
        margin-left: 24px;
      }

    }
  }
}

.Scaffold>.fab-dock {
  position: fixed;
  bottom: 40px;
  right: 40px;
  z-index: var(--tutu-zidx-nav, auto);
}

.Scaffold>.bottom-dock {
  position: sticky;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--tutu-zidx-nav, auto);
}

.Scaffold {
  height: 100%;
  width: 100%;
  background-color: var(--tutu-color-surface);
}