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
Image Transparency
The opacity property specifies the transparency of an element. The lower the value, the more transparent:
Image with 30% opacity:

CSS
img {
opacity: 0.3;
}
Output

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

CSS
img {
opacity: 0.5;
}
img:hover {
opacity: 1.0;
}
Output

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:
This is some text that is placed in the transparent box.
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

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.