CSS Fonts

CSS Tutorial


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CSS Advanced


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CSS Responsive

CSS Grid

CSS Font

Font Size

The font-size property is used to set the size of the text.

It is important to manage the text size in web design. Avoid using the  font size adjustments to make paragraphs such as headings, or headings look like paragraphs.

Always make use of the proper HTML tags, like <h1> – <h6> for headings and <p> for paragraphs.

The font-size value is either absolute, or relative size.

Absolute size:

  • Adjusts the text to a specified size
  • The user cannot change the text size in all browsers.
  • Absolute size is useful when the output of the physical size is known.

Relative size:

  • Adjusts the size relative to nearby elements.
  • Enables the user to change the text size in browsers.

Set Font Size with Pixels

When the text size  is set with pixels, it gives full control over the text size:

				
					<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<p>This is a paragraph.</p>
<p>This is another paragraph.</p>
				
			
CSS
				
					h1 {
  font-size: 40px;
}
h2 {
  font-size: 30px;
}

p {
  font-size: 14px;
}
				
			

Output

font size

Set Font Size with Em

To resize the text, many developers use em in place of pixels.

1em is equal to the current font size. The default text size in browsers is 16px. So, the default size of 1em is 16px.

To calculate the size calculated from pixels to em use this formula: pixels/16=em

HTML
				
					<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<p>This is a para.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum</p>
				
			
CSS
				
					h1 {
  font-size: 1.5em; /* 40px/16=2.5em */
}
h2 {
  font-size: 1.875em; /* 30px/16=1.875em */
 }
p {
  font-size: 0.875em; /* 14px/16=0.875em */
}
				
			

Output

font size in em

Use a Combination of Percent and Em

The solution which works in all browsers, is positioned to default font-size in percent for the <body> element:

HTML
				
					<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<p>This is a para.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum</p>
				
			
CSS
				
					body {
  font-size: 100%;
}

h1 {
  font-size: 2.5em;
}

h2 {
  font-size: 1.875em;
}

p {
  font-size: 0.875em;
}

				
			

Output

percent in font size

Responsive Font Size

The text size is specified with a vw unit, which refers to the “viewport width”.

The text size follows the size of the browser window

				
					<h1 style="font-size:10vw;">Responsive Text</h1>
<p style="font-size:5vw;">Resize the browser window to see how the text size scales.</p>
<p style="font-size:5vw;">Use the "vw" unit when sizing the text. 10vw will set the size to 10% of the viewport width.</p>
<p>Viewport is the browser window size. 1vw = 1% of viewport width. If the viewport is 50cm wide, 1vw is 0.5cm.</p>
				
			

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