placeholders.less

.placeholder(@color) {
  // WebKit, Blink, Edge
  ::-webkit-input-placeholder {
    color: @color;
  }
  // Mozilla Firefox 4 to 18
  :-moz-placeholder {
    opacity: 1;
    color: @color;
  }
  // Mozilla Firefox 19+
  ::-moz-placeholder {
    opacity: 1;
    color: @color;
  }
  // Internet Explorer 10-11
  :-ms-input-placeholder {
    color: @color;
  }
  // Microsoft Edge
  ::-ms-input-placeholder {
    color: @color;
  }
  // Most modern browsers support this now.
  ::placeholder {
    color: @color;
  }
}