How to Change Font Size in CSS: (With 1 new style)

How to Change Font Size in CSS- In web design, text size is crucial in creating visually appealing and readable content. In CSS, the font-size property is the key tool for controlling text size in HTML elements. In this article, we will cover everything you need to know about using the font-size property, including how to set different values and units for this property. We’ll explore practical examples, offer useful tips, and ensure you walk away with a complete understanding of how to change font size in CSS.

What is the font-size Property in CSS?

The font-size property in CSS determines the size of text within HTML elements. It allows you to control the appearance of your text by setting specific values, ensuring the right balance between readability and design. Whether you want larger headers or smaller captions, the font size property helps you adjust your typography effectively.

In CSS, there are different values and units you can use to define the size of text, offering flexibility depending on the design goals of your website.

CSS Font-Size Values and Units

When changing the font size in CSS, you have a variety of values and units to choose from, each suited for different use cases.

Keywords

You can use keywords to set predefined font sizes in CSS. Here are some examples:

• xx-small
• x-small
• small
• medium (default)
• large
• x-large
• xx-large
• smaller (relative to parent)
• larger (relative to parent)

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Length Units (px, em, rem, vw, etc.)

• Pixels (px): Pixels are a fixed-size unit, great for precision but not ideal for responsive design. Example: font-size: 16px;
• Ems (em): This is a relative unit based on the font size of the parent element. Example: font-size: 1.2em;
• Rems (rem): Rems are relative to the root element (html). They offer a consistent way to size text across an entire page. Example: font-size: 1.5rem;
• Viewport Width (vw): Text size can adapt to the size of the browser window. Example: font-size: 5vw;

How to Change Font Size in CSS with Examples

Let’s look at some examples of how to change font sizes in CSS.

Example 1: Changing Font Size Using Pixels

h1 {
  font-size: 24px; /* Set the size of h1 text to 24 pixels */
}
p {
  font-size: 16px; /* Set paragraph text to 16 pixels */
}

In this example, we specify the font size for h1 as 24 pixels and for p (paragraph) as 16 pixels.

Example 2: Changing Font Size Using Relative Units (em and rem)

h2 {
  font-size: 1.5em; /* 1.5 times the size of the parent element's font size */
}
p {
  font-size: 1rem; /* 1 rem equals the font size of the root element */
}

Relative units allow for scalable and responsive text that adjusts based on the surrounding elements.

Example 3: Using Viewport Units to Set Font Size

h3 {
  font-size: 5vw; /* 5% of the viewport width */
}

Using Media Queries to Adjust Font Size for Different Devices

Media queries allow you to adjust the font size based on the screen size. For example:

@media (max-width: 600px) {
  body {
    font-size: 14px;
  }
}

This ensures that smaller screens display text in a more readable size.

Responsive Font Size Techniques

Fluid Typography

Fluid typography is the technique of using relative units in combination with media queries to create text that adapts fluidly to the screen size.

html {
  font-size: calc(1rem + 1vw);
}

This allows your text to grow and shrink dynamically with the size of the viewport.

Best Practices for Setting Font Sizes

• Use rem for consistent sizing across a site.
• Avoid using fixed pixel sizes for body text.
• Implement responsive design techniques using media queries and relative units.
• Test across different devices for readability.

Table of Common CSS Font-Size Units

Unit	Description	Example
px	Pixels (fixed size)	font-size: 16px;
em	Relative to parent element	font-size: 1.2em;
rem	Relative to root element	font-size: 1.5rem;
%	Percentage of parent font size	font-size: 150%;
vw	Viewport width	font-size: 5vw;

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