A simple way to visually indicate that a form input is required using plain HTML and CSS.

required-form-input.md

Following this guide will get you the red asterisks* beside form inputs, that you are used to seeing on forms across the internet.

Include the following CSS:

<style>
  label.required:after {
    content: " *";
    color: red;
  }
</style>

Then make sure all required form inputs have the required attribute, like:

<input id="name" name="name" type="text" required />

And make sure all corresponding labels for the required form inputs have the required class, like:

<label for="name" class="required">Name</label>