How to get a div inside with css

Question

How to make this arc in div with css ?

I tried with border-Radius: 0px 0px 100% 0px; but it’s not cool

Answer 1

You can try to use only the border-Radius of the direction you want to create the Radius.

try this:

.div1 {
  background-color: red;
  width: 300px;
  height: 400px;
}

.div2 {
  background-color: green;
  width: 300px;
  height: 400px;
  border-top-left-radius: 400px 200px;
  border: 3px solid #000;
}

<div class="div1">
  <div class="div2">
  </div>
</div>

jsfiddle