How to Create a Fading Background Without Affecting Child Element Visibility Using HTML/CSS?

Opacity Manipulation without Affecting Child Elements Using HTML/CSS

Problem:

Implementing a fading effect for the background while keeping a child element visible can be challenging using opacity alone. This is encountered when attempting to create a popup box that highlights itself by dimming the underlying content.

Solution:

To achieve the desired effect, combine opacity with background color as follows:

<code class="css">#container {
    border: solid gold 1px;   
    width: 400px;
    height: 200px;
    background:rgba(56,255,255,0.1);
}

#box {
    border: solid silver 1px;
    margin: 10px;
    width: 300px;
    height: 100px;
    background:rgba(205,206,255,0.1);
}</code>

By setting the background property with a rgba value, you specify the opacity of the container, which represents the content behind the popup box, while preserving the visibility of the #box element. The rgb values represent the color, while the a value indicates the transparency level.

To apply this approach, implement the CSS code provided and include the following HTML:

<code class="html"><div id="container">
    container text
    <div id="box">
        box text
    </div>
</div></code>

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