How to change placeholder input field text color in css

HTML 

 <input type="email" placeholder="support@webcaty.com">

 CSS 

::-webkit-input-placeholder { /* for Chrome/Opera/Safari */
  color: green;
}
::-moz-placeholder { /* for Firefox 19+ */
  color: green;
}
:-ms-input-placeholder { /* for IE 10+ */
  color: green;
}
:-moz-placeholder { /* for Firefox 18- */
  color: green;
}