---
title: Opacity
description: Control the opacity of elements.
added:
  version: "5.1"
---

The `opacity` property sets the opacity level for an element. The opacity level describes the transparency level, where `1` is not transparent at all, `.5` is 50% visible, and `0` is completely transparent.

Set the `opacity` of an element using `.opacity-{value}` utilities.

100%
  
75%
  
50%
  
25%
  
0%

```html
<div class="opacity-100">...</div>
<div class="opacity-75">...</div>
<div class="opacity-50">...</div>
<div class="opacity-25">...</div>
<div class="opacity-0">...</div>
```

## CSS

### Sass utilities API

Opacity utilities are declared in our utilities API in `scss/_utilities.scss`. [Learn how to use the utilities API.]([[docsref:/utilities/api#using-the-api]])

<ScssDocs name="utils-opacity" file="scss/_utilities.scss" />
