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<html>
  <body>
    <button class="my-button">Hover Me</button>
  </body>
</html>

# Pseudo-class

A `CSS pseudo-class` applies styles to a web page element based on a specific state (e.g., click, focus).

Pseudo-classes are used by appending a colon (`:`) to a selector, with `:hover` being one of the most commonly used examples.

The hover pseudo-class allows you to define a style for when the mouse cursor hovers over an HTML element.

Check out the example below that uses the `:hover` pseudo-class.

<br />

```html title="HTML button with my-button class"
<html>
  <body>
    <button class="my-button">Hover Me</button>
  </body>
</html>
```

<br />

## CSS

```css title="Applying CSS to my-button"
.my-button {
  display: inline-block;
  padding: 10px 20px;
  background-color: #0000ff;
  color: #fff;
  border-radius: 5px;
  transition: background-color 0.3s ease;
  border: none;
}

.my-button:hover {
  background-color: #ff0000;
}
```

This CSS code styles a button (`<button>`) element with the `.my-button` class.

The my-button class uses the `.my-button:hover` pseudo-class to change the background color to red when the mouse cursor hovers over the button.

Notably, the `transition` property adds a smooth animation to property changes.

In this example, a 0.3-second transition effect is applied to the background-color change, making the button's color change smoothly.

CSS pseudo-classes allow you to apply styles only under specific conditions. You use them by adding a colon (:) after the selector. For example, you can change the style of an element when the mouse cursor hovers over it.

### Which of the following is an example of correctly using a CSS pseudo-class?