CSS Viewport: How to create adaptive screen height using vh and vmax

CSS Viewport: How to create adaptive screen height using vh and vmax

In modern web design, adaptive layout has become an essential technology. Since the screen sizes and resolutions of different devices vary, how to display the page well on various devices becomes a challenge.

In CSS, Viewport is an important element used to control the layout and display of web pages. Viewport can be regarded as the window of the web page view, which defines the width, height, zoom ratio and other related properties of the web page. In this article, we will introduce how to use the vh and vmax units of Viewport to implement adaptive screen height.

vh (viewport height) is the percentage unit of Viewport height, which represents a certain ratio relative to the height of the viewport. For example, if an element's height is set to 50vh, its height will occupy 50% of the viewport's height.

vmax represents the maximum size value of Viewport, which is the larger of vh and vw (viewport width). In other words, vmax can determine its value based on the larger of the width and height of the viewport.

Next, we will use sample code to demonstrate how to use vh and vmax to create adaptive screen height.

First, we need to add the following code in the <meta> tag in the HTML header to tell the browser to set the Viewport:

<meta name="viewport" content="width=device-width, initial-scale=1">

Then, In CSS style sheets, we can use vh and vmax units as follows:

body {
  margin: 0;
}

.container {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.text {
  font-size: 4vmax;
}

In the above example code, we create a container (.container) with a height of 100vh and center it in it A text (.text) is displayed. The container uses the display: flex attribute to achieve vertical and horizontal centering. Additionally, the text's font size is set to 4vmax so that it dynamically adjusts to the larger of the viewport's height and width.

Through the above CSS code, we can implement a layout that adapts to the screen height. This layout will look good on different devices depending on the device's screen size.

To summarize, using vh and vmax units can help us create a layout that adapts to the screen height. By setting the element's height to vh units, we can make it occupy a proportion of the viewport's height. Using vmax units allows you to dynamically resize elements based on the larger of the width and height of the viewport.

I hope that through the introduction and sample code of this article, you can better understand and use vh and vmax units, thereby achieving better adaptive web page layout. In actual project development, we can combine vh, vmax and other CSS attributes according to specific needs and design requirements to create a more flexible and beautiful web page layout.

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