cross-browsers-input-placeholders.scss

input {
  &::placeholder {
      color: $color;
    }

    &::-webkit-input-placeholder {
      color: $color;
    }

    &::-moz-placeholder {
      color: $color;
      opacity: 1;
    }

    &:-ms-input-placeholder {
      color: $color;
    }

    &:-moz-placeholder {
      color: $color;
      opacity: 1;
    }
}