How to set web fonts in css

CSS (Cascading Style Sheets) is a language used to describe the style of web pages. Among them, font settings are an important part of CSS because they can control the size, color, font type and line height of text in web pages.

Font setting can be achieved by using the "font" attribute in the CSS file. Let’s look at each of these properties one by one.

1. font-size
   The font-size property is used to set the size of text. It can be set in absolute or relative units. Relative units include em, rem, %, etc., while absolute units include px, pt, cm, etc. Among them, the pixel unit (px) is the most commonly used unit because it ensures that text size remains consistent across all devices. For example:

h1{
  font-size: 36px;
}

The above code specifies the text size of the h1 element to be 36 pixels.

2. font-family
   The font-family property is used to specify the type of font displayed in text. Multiple font types are written as alternatives so that if the user's operating system default font does not support the selected font, the alternative font can be used for display. For example:

body{
  font-family: Arial, Helvetica, sans-serif;
}

The above code specifies the font type of the text in the body element to be Arial. If this font type is not available, try to use the Helvetica font type. If Helvetica is also unavailable, the system default sans-serif font type is used.

3. font-weight
   The font-weight attribute represents the thickness of the text as a number or keyword. The higher the number, the thicker the text. Keywords include normal, bold, bolder, and lighter. For example:

p{
  font-weight: bold;
}

The above code specifies that the text within the p element is displayed in bold.

4. font-style
   The font-style attribute describes the font style of the text, which can be normal (normal), italic (italic) and oblique (italic). For example:

em{
  font-style: italic;
}

The above code specifies that the text within the em element is displayed in italics.

5. line-height
   The line-height property defines the spacing between lines of text. It can be set using length or percentage as value. For example:

p{
  line-height: 1.5;
}

The above code specifies that the line height of the text in the p element is 1.5 times the text size. If the text size is 16 pixels, the line height is 24 pixels.

6. text-align
   The text-align attribute is used to control the alignment of text within an element. It can be set to left (left-aligned), center (center-aligned), right (right-aligned), etc. For example:

h1{
  text-align: center;
}

The above code specifies that the text within the h1 element is centered.

7. text-decoration
   The text-decoration attribute is used to specify the decoration effect of text, such as underline, strikethrough, etc. It can be set to none, underline, overline, line-through, etc. For example:

a{
  text-decoration: underline;
}

The above code specifies the underline effect for all link elements.

To summarize, font settings in CSS can be achieved through a variety of properties, including font-size, font-family, font-weight, font-style, line-height, text-align and text-decoration wait. Learning to master these attributes can provide us with more choices and flexibility in web design.

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