Try it Editor: CSS3 border-radius Property

Edit This Code :

<!DOCTYPE html>
<html>
<head>
<style> 
#rcorners1 {
    border-radius: 25px;
    background: #73AD21;
    padding: 20px; 
    width: 200px;
    height: 150px;    
}

#rcorners2 {
    border-radius: 25px;
    border: 2px solid #73AD21;
    padding: 20px; 
    width: 200px;
    height: 150px;    
}

#rcorners3 {
    border-radius: 25px;
    background: url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgGucIT4Xug_cVVX0FwRdBPGLj28vsUwJoaKhqbFTgn_gZXyHvbsrabcnNJQfMQjFsBcscytrNtjJAeCnaXvr7noJRrrC0PsIm2v1TjFgWZXnh8KbrdfJrE8aLcTZfwbggWyZ-PMh52C9CL/s1320/paris.jpg);
    background-position: left top;
    background-repeat: repeat;
    padding: 20px; 
    width: 200px;
    height: 150px;    
}
</style>
</head>
<body>

<p>The border-radius property allows you to add rounded corners to elements.</p>
<p>Rounded corners for an element with a specified background color:</p>
<p id="rcorners1">Rounded corners!</p>
<p>Rounded corners for an element with a border:</p>
<p id="rcorners2">Rounded corners!</p>
<p>Rounded corners for an element with a background image:</p>
<p id="rcorners3">Rounded corners!</p>

</body>
</html>
Result :