@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);
  }
}
@mixin avatar-colors {
  &.red         { background-color: $material_red         ; }
  &.pink        { background-color: $material_pink        ; }
  &.purple      { background-color: $material_purple      ; }
  &.deep_purple { background-color: $material_deep_purple ; }
  &.indigo      { background-color: $material_indigo      ; }
  &.blue        { background-color: $material_blue        ; }
  &.light_blue  { background-color: $material_light_blue  ; }
  &.cyan        { background-color: $material_cyan        ; }
  &.teal        { background-color: $material_teal        ; }
  &.green       { background-color: $material_green       ; }
  &.light_green { background-color: $material_light_green ; }
  &.orange      { background-color: $material_orange      ; }
  &.deep_orange { background-color: $material_deep_orange ; }
  &.amber       { background-color: $material_amber       ; }
  &.blue_grey   { background-color: $material_blue_grey   ; }
  &.grey        { background-color: #999999               ; }
  &.default     { background-color: $blue                 ; }
}