signal-desktop/stylesheets/_lightbox.scss

.lightbox-container {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 100;
}

.iconButton {
  @include button-reset;

  // NOTE: Cannot move these to inline styles as hover breaks due to precedence.
  // We use vanilla CSS-in-JS which outputs inline styles. The `:hover`
  // pseudo-class cannot be expressed using vanilla CSS-in-JS, so we define it
  // here. If we move the other properties to JS, they have higher precedence
  // as they are inline and the `:hover` `background` change won’t override the
  // base `background` definition. Revisit this as we adopt a more sophisticated
  // style system in the future:
  background: transparent;
  width: 50px;
  height: 50px;

  display: inline-block;
  border-radius: 50%;
  padding: 3px;

  &:before {
    content: '';
    display: block;
    width: 100%;
    height: 100%;
  }

  &:hover,
  &:focus {
    background: $color-gray-60;
  }

  &.save {
    &:before {
      @include color-svg(
        '../images/icons/v2/save-outline-24.svg',
        $color-white
      );
    }
  }

  &.close {
    &:before {
      @include color-svg('../images/icons/v2/x-24.svg', $color-white);
    }
  }

  &.previous {
    &:before {
      @include color-svg(
        '../images/icons/v2/chevron-left-24.svg',
        $color-white
      );
    }
  }

  &.next {
    &:before {
      @include color-svg(
        '../images/icons/v2/chevron-right-24.svg',
        $color-white
      );
    }
  }
}