Mixin for styling the placeholder attribute on form fields

_placeholder.scss

// Usage
// @include placeholder {
//    font-style:italic;
//    color: white;
//    font-weight:100;
// }

@mixin placeholder {
  ::-webkit-input-placeholder {@content}
  :-moz-placeholder           {@content}
  ::-moz-placeholder          {@content}
  :-ms-input-placeholder      {@content}
}