How to give text or an image transparent background using CSS?

The opacity property is used to set image or text transparent using CSS. The opacity attribute is used to adjust the transparency of text or picture. The value of opacity lies between 0.0 to 1.0 where the low value represents high transparent and high value represents low transparent. The percentage of opacity is calculated as Opacity% = Opacity * 100

Syntax:

element {
    opacity: value;
    // CSS property
}

Example 1: This example describes the image transparent.



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<!DOCTYPE html> 
<html
    <head
        <title>Opacity property</title
        <style
            .forest { 
                opacity: 0.3; 
            
            .opacity { 
                padding-top:300px;
                text-align:center; 
            
            body {
                background:url(wind.jpg) no-repeat;
                background-size:cover;
            }
        </style
    </head
    <body
        <div class = "opacity">
            <img class = "forest" src = "geeks.png"
        </div
    </body
</html>                     

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Output:

Example 2: This example describes the text transparent.

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<!DOCTYPE html> 
<html
    <head
        <title>Transparent box</title
        <style
            .geeks { 
                background: rgb(0, 153, 0); 
                padding: 15px; 
                text-align:center; 
                width:300px; 
            
      
            #geek { 
                padding: 15px; 
                text-align:center; 
                width:300px; 
            
            .rgba1 { 
                background: rgba(0, 153, 0, 0.1); 
            
              
            .rgba2 { 
                background: rgba(0, 153, 0, 0.5); 
            
              
            .rgba3 { 
                background: rgba(0, 153, 0, 0.8); 
            
            .rgba4 { 
                background: rgba(0, 153, 0, 1.0); 
            
            .g1 { 
                float:left; 
                margin-left:50px; 
            
            .g2 { 
                margin-top:-40px; 
                margin-left:50px; 
                float:left; 
            
        </style
    </head
    <body
        <div class ="g1"
            <p style = "font-size:24px;font-weight:bold;">Transparent Box</p
            <div class = "geeks" style="opacity:0.1;"><p>10% opacity</p></div
            <div class = "geeks" style="opacity:0.5;"><p>50% opacity</p></div
            <div class = "geeks" style="opacity:0.8;"><p>80% opacity</p></div
            <div class = "geeks"><p>100% opacity</p></div></div><br><br
              
        <div class = "g2"
            <p style = "font-size:24px;font-weight:bold;">RGBA color values</p
            <div class="rgba1" id = "geek"><p>10% opacity</p></div
            <div class="rgba2" id = "geek"><p>50% opacity</p></div
            <div class="rgba3" id = "geek"><p>80% opacity</p></div
            <div class="rgba4" id = "geek"><p>100% opacity</p></div>
        </div
    </body
</html>                                     

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