How to use CSS Viewport units to adjust font size based on screen size

How to use CSS Viewport units to adjust the font size according to the screen size

CSS Viewport units are a unit relative to the viewport size, which can help us adjust the font size according to the screen size Dimensions dynamically adjust font size. In the era of mobile devices, this technology can help us solve the problem of too large or too small fonts caused by diverse screen sizes. This article explains how to use CSS Viewport units to adjust font size based on screen size, and provides some specific code examples.

1. Use VW units

Viewport width unit (Viewport Width unit, referred to as VW) is a unit relative to the width of the viewport. The basic usage is as follows:

h1{
  font-size: 4vw;
}

In the above code, the font size of the h1 tag will be adjusted as the viewport width changes, maintaining a proportional relationship with the viewport width.

2. Use VH unit

Viewport height unit (Viewport Height unit, referred to as VH) is a unit relative to the height of the viewport. The basic usage is as follows:

p{
  font-size: 3vh;
}

In the above code, the font size of the p tag will be adjusted as the viewport height changes, maintaining a proportional relationship with the viewport height.

3. Use Vmin and Vmax units

Viewport minimum width unit (Viewport Minimum unit, referred to as Vmin) is relative to the smaller value of the viewport width and height A unit of Viewport maximum width unit (Viewport Maximum unit, referred to as Vmax) is relative to the larger value of the viewport width and height. The basic usage is as follows:

h2{
  font-size: 2vmin;
}
h3{
  font-size: 2vmax;
}

In the above code, the font size of the h2 tag will be adjusted with the change of the smaller value of the viewport width and height, and the font size of the h3 tag will be adjusted with the viewport width. and height changes to larger values.

4. Combined with media queries

In order to get better results on screens of different sizes, we can combine media queries to achieve more precise font size adjustment. For example, if you want to use different font sizes under different screen widths, you can use the following code:

h4{
  font-size: 20px;
}

@media screen and (max-width: 600px){
  h4{
    font-size: 15px;
  }
}

In the above code, the font size of the h4 tag will be adjusted to 15px when the screen width is less than 600px. Otherwise keep it at 20px.

By using CSS Viewport units and media queries, it is easy to adjust the font size according to the screen size. Not only can web pages be displayed more beautifully and comfortably on screens of different sizes, but it can also improve user experience.

With the above code example, we can easily adapt the font size to suit different devices and screen sizes. This responsive design approach ensures that our web pages are optimally readable and viewable on a variety of devices. Hope this article is helpful to you!

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