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How to round div corners using CSS

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Created by:
James-Z
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Did you know that you can assign different radiuses of curvature to different edges in an HTML div element?

Today, I'd like to show you how to easily round corners in HTML elements using CSS. 😊

Final effect:

CSS - div with rounded corners example
CSS - div with rounded corners example

There are several ways to round element depending on which corners you want to round.

Round each corner with the same value

In this solution, we use border-radius property with one value to round each corner of the div with the given value.

Runnable example:

// ONLINE-RUNNER:browser;

<!DOCTYPE >
<html>
  <head>
    <style>
      div {
        height: 100px;
        width: 120px;
        background-color: #b5edc2;
        border-radius: 25px; /* <---------- use this to round all corners in div */
      }
    </style>
  </head>
  <body>
    <div></div>
  </body>
</html>

Round diagonally opposite corners

In this solution, we use border-radius property with two values to round diagonally opposite corners of the div with two different values.

Runnable example:

// ONLINE-RUNNER:browser;

<!DOCTYPE >
<html>
  <head>
    <style>
      div {
        height: 100px;
        width: 120px;
        background-color: #b5edc2;
        border-radius: 25px 45px; /* <---------- use this to round the opposite corners */
      }
    </style>
  </head>
  <body>
    <div></div>
  </body>
</html>

Round each corner with a different value

In this solution, we use border-radius property with four values to round each corner of the div with a different value, clockwise.

CSS - rounded corners with different values example
CSS - rounded corners with 4 border-radius property values (clockwise direction)

Runnable example: 

// ONLINE-RUNNER:browser;

<!DOCTYPE >
<html>
  <head>
    <style>
      div {
        height: 100px;
        width: 120px;
        background-color: #b5edc2;
        border-radius: 10px 30px 20px 40px; /* <----- use this to round all corners in div */
      }
    </style>
  </head>
  <body>
    <div></div>
  </body>
</html>

Custom rounded corners

In this solution, we use border-radius property with three values to round corners of the div in the following way:

  • first value describes top-left corner - 20px radius,
  • second value describes opposite top-right and bottom-left corners - 45px radius,
  • third value describes bottom-right corner - 30px radius.

Runnable example:

// ONLINE-RUNNER:browser;

<!DOCTYPE >
<html>
  <head>
    <style>
      div {
        height: 100px;
        width: 120px;
        background-color: #b5edc2;
        border-radius: 20px 45px 30px; /* <---------- use this to round corners*/
      }
    </style>
  </head>
  <body>
    <div></div>
  </body>
</html>

You can also manually specify which corner you want to round with given value like this: 

// ONLINE-RUNNER:browser;

<!DOCTYPE >
<html>
  <head>
    <style>
      div {
        height: 100px;
        width: 120px;
        background-color: #b5edc2;
        border-top-left-radius: 25px; /* <----- top-left corner round      */
        border-top-right-radius: 30px; /* <----- top-right corner round     */
        border-bottom-right-radius: 40px; /* <----- bottom-right corner round  */
        border-bottom-left-radius: 50px; /* <----- bottom-left corner round   */
      }
    </style>
  </head>
  <body>
    <div></div>
  </body>
</html>

Circle div example

We can also use border-radius property with percentage values. In this solution I've set the property value to 50% to make a circle div.

Runnable example:

// ONLINE-RUNNER:browser;

<!DOCTYPE >
<html>
  <head>
    <style>
      div {
        height: 100px;
        width: 100px;
        background-color: #b5edc2;
        border-radius: 50%; /* <------ use this to make circle div (NOTE: height=width) */
      }
    </style>
  </head>
  <body>
    <div></div>
  </body>
</html>

Thanks for reading and see you in the next posts! 😊🔜

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References

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