signal-desktop/stylesheets/_mixins.scss

@mixin button-reset {
  background: none;
  color: inherit;
  border: none;
  padding: 0;
  font: inherit;
  cursor: pointer;
  outline: inherit;
}

@mixin color-svg($svg, $color) {
  -webkit-mask: url($svg) no-repeat center;
  -webkit-mask-size: 100%;
  background-color: $color;
}

@mixin header-icon-white($svg) {
  @include color-svg($svg, rgba(255, 255, 255, 0.8));
  &:focus,
  &:hover {
    @include color-svg($svg, white);
  }
}
@mixin header-icon-black($svg) {
  @include color-svg($svg, rgba(0, 0, 0, 0.5));
  &:focus,
  &:hover {
    @include color-svg($svg, black);
  }
}