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Setting Opacity for border

When you want to give opacity for border alone usually we try the following css,

.reduce-border-opacity{
     width: 150px;
    height: 150px;
    border: 5px solid black;
    opacity: 0.5;
    background-color: grey;
}

The above css will reduce the opacity of the element with class  “reduce-border-opacity” as shown below,


So to reduce the opacity of border alone, give the following css
    
     .reduce-border-opacity{
           width: 150px;        
           height: 150px;       
           border: 5px solid rgba(0,0,0,0.5);        
           background-color: grey;    
 }



Give your opacity as the last property in rgba. 

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