The border-radius property specifies the radius of the element's corners; it allows you to add rounded corners to elements. This property can have from one to four values. The four values for each radius are given in the order top-left, top-right, bottom-right, bottom-left. When one value is specified, it applies the same radius to all four corners.
Set rounded corners in pixels for a <h1> element.
h1 {
  border: 2px solid red;
  border-radius: 25px;
}
        
        
    
        
        
            Set rounded corners in percent for a <h1> element.
h1 {
  border: 2px solid red;
  border-radius: 20%;
}
        
        
    
    border-radius: value
border-radius.For more information, see http://www.w3schools.com/cssref/css3_pr_border-radius.asp
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