tutu/src/material/AppTopBar.css

.AppTopBar {
  &::before {
    contain: strict;
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: var(--safe-area-inset-top, 0);
    background-color: rgba(0, 0, 0, 0.2);
  }

  &>.MuiToolbar-root {
    padding-top: var(--safe-area-inset-top, 0px);
    gap: 8px;

    &>button:first-child,
    &>.MuiButtonBase-root:first-child {
      margin-left: -0.15em;
    }

    &>button:last-child,
    &>.MuiButtonBase-root:last-child {
      margin-right: -0.15em;
    }

    &>.title {
      margin-top: -0.2ch;
    }
  }
}