How can I darken the placeholder text in form fields?

I'd like to darken the text in placeholders and I don't have a clue what to do with CSS!

Thank you in advance!

Inject this CSS codes to your form.

.form-custom-hint {

    color: #424242 !important;

}

This should darken the Text Area placeholder color only.

If you want to include the text box fields placeholder, use this.

::-webkit-input-placeholder {

  color: #424242;

}

::-moz-placeholder {

  color: #424242;

}

:-ms-input-placeholder {

  color: #424242;

}

:-moz-placeholder {

  color: #424242;

}

Feel free to change the color to your preference.