CSS Opacity

CSS Tutorial


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CSS Advanced


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CSS Responsive

CSS Grid

CSS Opacity / Transparency

The opacity property defines the opacity/transparency of an element.

Transparent Image

The opacity property ranges from 0.0 – 1.0. The lower value, the more transparent:

HTML
				
					<h1>Image Transparency</h1>
<p>The opacity property specifies the transparency of an element. The lower the value, the more transparent:</p>
<p>Image with 30% opacity:</p>
<img decoding="async" src="forest.jpg" alt="Forest" width="170" height="100">
				
			
CSS
				
					img {
  opacity: 0.3;
}
				
			

Output

opacity in css

Transparent Hover Effect

The opacity property is combined with the :hover selector to alter the opacity on mouse-over:

HTML
				
					<img decoding="async" src="forest.jpg" alt="Forest" width="170" height="100">
				
			
CSS
				
					img {
  opacity: 0.5;
}

img:hover {
  opacity: 1.0;
}

				
			

Output

Forest

Transparent Box

The opacity property adds transparency to the background of an element and all child elements inherits the same transparency. This enables the text within a fully transparent element hard to read:

				
					<div class="background">
  <div class="transbox">
    <p>This is some text that is placed in the transparent box.</p>
  </div>
</div>

				
			
CSS
				
					div.background {
  background: url(klematis.jpg) repeat;
  border: 2px solid black;
}

div.transbox {
  margin: 30px;
  background-color: #ffffff;
  border: 1px solid black;
  opacity: 0.6;
}

div.transbox p {
  margin: 5%;
  font-weight: bold;
  color: #000000;
}

				
			

Output

transperent box

Example explained

 A <div> element (class=”background”)  is created with a background image, and a border.

Another <div> (class=”transbox”) inside the first <div> is created.

The <div class=”transbox”> consists of a background color, and a border – the div is transparent.

Inside the transparent <div>, some text inside a <p> element is added.


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