How to set css line height

CSS is a language used to define web page styles and can control the appearance and layout of various elements. Among them, line-height refers to the space occupied by a line of text in the vertical direction. It is usually used together with font-size to adjust the layout effect of text. In this article, we will explain how to set row height using CSS.

1. Use pixel (px) units to set the row height

Using pixel units to set the row height is the most common method and the easiest to understand. The line height can be set in the following way:

p {
  font-size: 16px;
  line-height: 24px; 
}

In this example, font-size is 16px and line-height is 24px, which means one line The height of the text is 24 pixels. This setting is suitable for most situations, but it should be noted that this setting may show different effects under different font sizes and fonts.

2. Use percentage (%) units to set line height

Using percentage units may be more flexible because it can adapt to different font sizes. In the example below, we set the font size to 16px and the line height to 150%:

p {
  font-size: 16px;
  line-height: 150%;
}

This means that the line height will be set to 1.5 times the font size, which is 24px. This approach ensures the same line height for each font size and works at any scale.

3. Use the unit less value (em) to set the line height

Use the em unit to set the line height based on the current font size. Since em units are set relative to the current element's font size, text of different sizes is guaranteed to have the same line height. The example below sets line-height to 1.5em:

p {
  font-size: 16px;
  line-height: 1.5em;
}

In this case, when the text size is 16px, the line-height is 24px. But when you change the font size, for example font-size: 20px;, line-height will also change accordingly.

4. Use unitless numbers to set the row height

Using unitless numbers to set the row height is considered the most flexible method because it can adapt to any Font size of the text. In the example below, we set line-height to 1.5:

p {
  font-size: 16px;
  line-height: 1.5;
}

This means the line-height will be 1.5 times the font size, when the font size is 16px, the line-height is 24px. Using unitless values ​​is probably one of the most flexible and maintainable design methods because it can be applied to most situations.

Summary

You can set the row height in CSS using various methods such as pixels, percentages, em units and unitless values. Each method has its own advantages and disadvantages, and the choice needs to be based on the actual situation. No matter which method is used, the line-height value needs to be modified according to the design requirements to achieve better text layout effect.

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