HTML-CSS: Polka dot background pattern

Last update on May 28 2022 07:25:30 (UTC/GMT +8 hours)

HTML-CSS : Exercise-28 with Solution

Using HTML, CSS creates a polka dot background pattern.

Use background-color to set a black background.
Use background-image with two radial-gradient() values to create two dots.
Use background-size to specify the pattern's size. Use background-position to appropriately place the two gradients.
Note: The fixed height and width of the element is for demonstration purposes only.

HTML Code:

<!--License: https://bit.ly/3GjrtVF-->
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Using HTML, CSS creates a polka dot background pattern</title>
</head>
<body>
<div class="w3r-dot">
</div>
</body>
</html>

CSS Code:

.w3r-dot {
  width: 240px;
  height: 240px;
  background-color: #ccc;
  background-image: radial-gradient(#000 10%, transparent 11%),
    radial-gradient(#e53935 10%, transparent 11%);
  background-size: 60px 60px;
  background-position: 0 0, 30px 30px;
  background-repeat: repeat;
}

HTML-CSS Editor:

See the Pen html-css-practical-exercises by w3resource (@w3resource) on CodePen.

What is the difficulty level of this exercise?

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HTML-CSS: Tips of the Day

What is the difference between id and class in CSS, and when should I use them?

Example:

<div id="header_id" class="header_class">
Text
</div>

#header_id {font-color:#fff}
.header_class {font-color:#000}

(Note that CSS uses the prefix # for IDs and . for Classes.)

However color was an HTML 4.01 <font> tag attribute deprecated in HTML 5. In CSS there is no "font-color", the style is color so the above should read:

Example:

<div id="header_id" class="header_class">
Text
</div>

#header_id {color:#fff}
.header_class {color:#000}

The text would be white.

Ref: https://bit.ly/39Stv4P