excalidraw/src/components/Toolbar.scss

@import "open-color/open-color.scss";

@mixin toolbarButtonColorStates {
  .ToolIcon_type_radio,
  .ToolIcon_type_checkbox {
    & + .ToolIcon__icon:active {
      background: var(--color-primary-light);
    }
    &:checked + .ToolIcon__icon {
      background: var(--color-primary);
      --icon-fill-color: #{$oc-white};
      --keybinding-color: #{$oc-white};
    }
    &:checked + .ToolIcon__icon:active {
      background: var(--color-primary-darker);
    }
  }

  .ToolIcon__keybinding {
    bottom: 4px;
    right: 4px;
  }
}

.excalidraw {
  .App-toolbar-container {
    .ToolIcon_type_floating {
      @include toolbarButtonColorStates;

      &:not(.is-mobile) {
        .ToolIcon__icon {
          padding: 1px;
          background-color: var(--island-bg-color);
          box-shadow: 1px 3px 4px 0px rgb(0 0 0 / 15%);
          border-radius: 50%;
          transition: box-shadow 0.5s ease, transform 0.5s ease;
        }
      }

      .ToolIcon_type_radio,
      .ToolIcon_type_checkbox {
        &:focus-within + .ToolIcon__icon {
          // override for custom floating button shadow
          box-shadow: 0 0 0 2px var(--focus-highlight-color);
        }
      }
    }

    .ToolIcon__hidden {
      box-shadow: none !important;
      background-color: transparent !important;
      pointer-events: none !important;
    }

    .ToolIcon.ToolIcon__lock {
      margin-inline-end: var(--space-factor);
      &.ToolIcon_type_floating {
        margin-left: 0.1rem;
      }
    }

    .ToolIcon__library {
      margin-inline-start: var(--space-factor);
    }

    &.zen-mode {
      .ToolIcon_type_floating {
        .ToolIcon__icon {
          box-shadow: none;
          transform: scale(0.9);
        }
        .ToolIcon_type_checkbox:not(:checked):not(:hover):not(:active) {
          & + .ToolIcon__icon {
            svg {
              fill: $oc-gray-5;
              color: $oc-gray-5;
            }
          }
        }
      }
    }
  }

  .App-toolbar {
    border-radius: var(--border-radius-lg);
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.01), 1px 1px 5px rgb(0 0 0 / 15%);

    .ToolIcon {
      &:hover {
        --icon-fill-color: var(
          --color-primary-contrast-offset,
          var(--color-primary)
        );
        --keybinding-color: var(
          --color-primary-contrast-offset,
          var(--color-primary)
        );
      }
      &:active {
        --icon-fill-color: #{$oc-gray-9};
        --keybinding-color: #{$oc-gray-9};
      }

      .ToolIcon__icon {
        background: transparent;
        border-radius: var(--border-radius-lg);
      }

      @include toolbarButtonColorStates;
    }

    &.zen-mode {
      .ToolIcon__keybinding,
      .HintViewer {
        display: none;
      }
    }
  }

  &.theme--dark .App-toolbar .ToolIcon:active {
    --icon-fill-color: #{$oc-gray-3};
    --keybinding-color: #{$oc-gray-3};
  }
}