css sets font size

CSS sets the font size

CSS (Cascading Style Sheets, cascading style sheets) is a markup language used to describe the presentation effect of a document. In web design, CSS is often used to define the properties of text, color, background, border, style and other elements. Among them, font size is one of the most basic and commonly used properties in CSS.

CSS can set font size in many ways. Here are some common ways to set font sizes:

1. Using pixels (px)

Pixels (pixel, abbreviated as px) are the most common way to set font sizes The unit. When using pixels as the unit, the font size changes as the browser window is zoomed. For example, the following code sets the font size in the "body" element to 16 pixels: Depends on the font size of its parent element. For example, if an element's font size is 1em and its parent element's font size is 16px, then the element's font size will be 16px. If you set the font size to 2em, then its font size will be twice the font size of the parent element. The following code sets the font size in the "body" element to 1.2em:

body {
  font-size: 16px;
}

2. Using Percentage

Percentage is a relative unit and its size depends on The font size of its parent element. For example, if an element's font size is 100% and its parent element's font size is 16px, then this element's font size will also be 16px. If you set the font size to 120%, then its font size will be 120% of the parent element's font size. The following code sets the font size in the "body" element to 120%:

body {
  font-size: 1.2em;
}

3. Use rem

rem is a relative unit and its size depends on The font size of the root element. By default, the font size of the root element is 16px. If you set the font size to 2rem, then its font size will be 32px (2 times 16px). The following code sets the font size in the "body" element to 1.5rem:

body {
  font-size: 120%;
}

When using CSS to set the font size, you need to pay attention to the following points:

When setting the font The size should follow a uniform scale. For example, you can set the base font size to 16px and adjust from there.

The font size should suit the style and needs of the web design. Generally speaking, the font size of the main text should be between 14px and 18px, and the font size of the title should be between 20px and 32px.

For mobile web design, relative units (such as em, rem) should be used to set the font size to adapt to screens of different sizes.

1. CSS Setting the font size is one of the most basic and important attributes in web design. By setting font sizes correctly, you can make your web pages more readable and usable, thereby improving the user experience.

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