A Sass mixin to easily style placeholder text

placeholder.scss

// placeholder styling (use: @include placeholder(#e5e5e5);)
@mixin placeholder($color){
  &::-webkit-input-placeholder {
    color: $color;
  }
  &:-moz-placeholder { /* Firefox < 18 */
    color: $color;
    opacity:  1;
  }
  &::-moz-placeholder { /* Firefox >= 19 */
    color: $color;
    opacity:  1;
  }
  &:-ms-input-placeholder {
    color: $color;
  }
}