CSS Properties: How to set rounded border to an element?

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HTML Code:

<!DOCTYPE html><!-- Declaration of HTML5 document type -->
<title>How to set rounded border to an element</title><!-- Title of the HTML document -->
<style type="text/css">
/* CSS styling */
div {
border: 3px solid #FF0000; /* Sets a solid red border with a thickness of 3 pixels */
padding: 10px 40px; /* Sets the padding inside the div */
background: #00CCCC; /* Sets the background color to a light blue shade */
width: 150px; /* Sets the width of the div */
border-radius: 25px; /* Sets the border radius to create rounded corners */
<h1>w3resource Tutorial</h1><!-- Heading -->
<div>The border-radius property allows adding rounded corners to elements.</div><!-- Div element with rounded corners -->


  • This HTML document demonstrates how to create a rounded border effect for an element using CSS.
  • The div element is styled with a solid border that has a thickness of 3 pixels and a color of #FF0000 (red).
  • Padding is set to 10 pixels at the top and bottom and 40 pixels on the left and right sides of the div.
  • The background color of the div is set to #00CCCC (light blue).
  • The width of the div is set to 150 pixels.
  • The border-radius property is used to create rounded corners for the div. A value of 25 pixels is specified, resulting in a noticeable curvature at each corner.
  • As a result, the div appears with rounded corners and a solid red border, providing a visually appealing design.

Live Demo:

See the Pen border-radius-answer by w3resource (@w3resource) on CodePen.

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