How to create a full screen background image using CSS Viewport units vh and vw-CSS Tutorial-php.cn

How to create a full screen background image using CSS Viewport units vh and vw

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Release： 2023-09-13 10:57:14

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使用 CSS Viewport 单位 vh 和 vw 创建全屏背景图像的方法

How to create a full-screen background image using CSS Viewport units vh and vw, specific code examples are required

With the popularity of mobile devices and responsive design, full-screen background images has become a common element in design. The traditional way is to use JavaScript or jQuery to achieve this, but now you can easily implement a full-screen background image by leveraging the CSS Viewport units vh and vw. Viewport units are relative to the size of the viewport (that is, the browser window), vh represents a percentage of the viewport height, and vw represents a percentage of the viewport width.

In the following example, we show how to use CSS Viewport units to create a full-screen background image. First, we are going to create an HTML file and add the following code in it:

<!DOCTYPE html>
<html>
<head>
  <style>
    .fullscreen-bg {
      position: fixed;
      top: 0;
      left: 0;
      width: 100vw;
      height: 100vh;
      overflow: hidden;
      z-index: -1;
    }
    .fullscreen-bg img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
  </style>
</head>
<body>
  <div class="fullscreen-bg">
    <img src="background-image.jpg" alt="Background Image">
  </div>
</body>
</html>

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In the above example, we created a class named fullscreen-bg&lt ;div> element, which will fill the entire viewport. We inserted an <img> element inside to display the background image. We then use CSS to style these elements.

First, we set the position property of .fullscreen-bg to fixed so that it can always remain in the browser viewport the top and left side. Then, we position it at the top left corner of the page via top: 0 and left: 0. Next, we set its width and height to a percentage of the viewport using width: 100vw and height: 100vh so that it fills the entire viewport. We then hide its overflow content using overflow: hidden and place it below other content using z-index: -1.

Next, we set the width and height of .fullscreen-bg img to 100% and use object-fit: cover to fill the entire <img> A container for elements that ensures that the image scales proportionally on any device and is fully displayed in the viewport.

Finally, we set the path to the sample image to background-image.jpg, which you can replace with the path to the background image you want.

With the above sample code, you can easily use CSS Viewport units vh and vw to create a full-screen background image. Remember to replace the image's path with your own background image to adapt it to your design needs. Hope this article helps you!

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