vue-material/src/components/mdToolbar/mdToolbar.theme

.THEME_NAME {
  .md-toolbar,
  &.md-toolbar {
    background-color: PRIMARY-COLOR;
    color: PRIMARY-CONTRAST;

    &.md-accent {
      background-color: ACCENT-COLOR;
      color: ACCENT-CONTRAST;
    }

    &.md-warn {
      background-color: WARN-COLOR;
      color: WARN-CONTRAST;
    }

    &.md-transparent {
      background-color: transparent;
      color: BACKGROUND-CONTRAST;
    }
  }
}