Add style to an input's placeholder element

Paste the following in the CSS stylesheet (additional CSS tool):

::placeholder, ::-webkit-input-placeholder, ::-moz-placeholder, :-ms-input-placeholder, ::-ms-input-placeholder, :-moz-placeholder {
  color: pink;
}

Then add style as desired.

Source: https://css-tricks.com/almanac/selectors/p/placeholder/