freeCodeCamp/guide/english/certifications/responsive-web-design/basic-css/use-a-css-class-to-style-an-element/index.md

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Use a CSS Class to Style an Element

Use a CSS Class to Style an Element

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Problem Explanation

In CSS, we can target the styling of specific elements that match the specified class attribute.

For example, if you have an element with a class of button, then we can style the look & feel as follows:

• Start with a . (period) character followed by the class name and add your style

.button {
  border: 2px solid black;
  text-align: center;
  display: inline-block;
  padding: 5px 10px;
}

Now, the real benefit of using class to style an element is to target multiple elements that have the matching class attribute. For example, if there are 2 buttons on a webpage and they both look similar in style but only differ in size, then we can use a common class to give them common styles and a unique class for each button to give them different size values.

The following HTML code snippet depicts 2 buttons:

• Sign up button that should have common button style + should be large in size
• Login button that should have common button style + should be small in size

<div class="button large">Sign up</div>
<div class="button small">Login</div>

Using the above defined .button class as a common style for both buttons, and using .large and .small class attributes to give them different sizes, we can achieve the look we want without duplicating our code.

.large {
  font-size: 20px
}

.small {
  font-size: 10px
}