Half circle shape with flat bottom border

Question

I want to create a shape like this

Behind the number circle

I have already started something but cannot organize my border from bottom

.circle {
  background: yellow;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: auto;
}

.shape {
  background: #000;
  display: inline-block;
  border: 10px solid #000;
  border-top-right-radius: 100px;
  border-top-left-radius: 100px;
}

<div class="shape">
  <div class="circle">

  </div>
</div>

Or a link to a fiddle https://jsfiddle.net/4fq95bcj/5/

its a half-circle with bottom-left and bottom-right border longer ..