placeholders.css

*::-webkit-input-placeholder {
  color: var(--text-muted) !important;
}

*:focus::-webkit-input-placeholder {
  color: var(--text-hover) !important;
}

/* Firefox < 19 */
*:-moz-placeholder {
  color: var(--text-muted) !important;
}

*:focus:-moz-placeholder {
  color: var(--text-hover) !important;
}

/* Firefox > 19 */
*::-moz-placeholder {
  color: var(--text-muted) !important;
}

*:focus::-moz-placeholder {
  color: var(--text-hover) !important;
}

/* Internet Explorer 10 */
*:-ms-input-placeholder {
  color: var(--text-muted) !important;
}

*:focus:-ms-input-placeholder {
  color: var(--text-hover) !important;
}