Need help with CSS file and HTML

(Rounded Corners) Create three div elements, each with a width and height of 100px. On the first element, create slightly rounded corners using a border of 3px black and border-radius of 10px. On the second element, use a border of 3px black and increase the border-radius to 50px. On the third, use a border of 3px black and increase the border-radius to 100px. Make the back- ground-color of each element a different color of your choosing. Inside each element, display the value of the border-radius in bold text.