1, HTML
2, CSS

2.8 Border Radius

What if you want your div not sharp, but rather curved.
In this case you are going to use the border-radius property. You can set the value of this property in pixel or other units, as the unit increases your div becomes more and more curved.

Try this code:
<html>
    <head>
        <style>
            div {
                width: 400px;
                height: 400px;
                background-color: black;
                border-radius: 15px;
            }
        </style>
    </head>
    <body>
        <div>
        </div>
    </body>
</html>


Your final image would look like this:


🙂 And also, if you want your div to be a circle you will make your border-radius to 50%.
⭐ Plus, don't forget to make your div a square or it would look an oval shaped div.

⭐ Another point, don't use percents on rectangles, because you will see weird shapes when you use it on them. Go try it yourself.