LukasOe made these circuit selector themed HTML and CSS radio buttons. The viewer keeps their focus on filling out the boxes. It uses large colorful boxes. So, styling them will make our site different and attractive. This cookie is set by CloudFare. This cookie is set by GDPR Cookie Consent plugin. How do I get radio button checked in HTML? The complete code is divided into two sections, the first section contains the HTML code and the second section contains the CSS code to create a custom radio button.HTML Code: In this section, we will create a simple radio button using the