How would I create this image?

What if I don’t want the half circle attached to the button?

When it is part of the button, then that entire half circle is clickable.

In both instances, how do I hide or remove the border line from going through the circle?

Full circle
https://jsfiddle.net/jdmsqxp8/4/

going throu

.circle {
  position: relative;
  top: 3px;
  left: 0;
  bottom: 0;
  right: 0;
  margin: auto;
  width: 59px;
  height: 59px;
  border-radius: 50%;
  background-color: #000;
  /* Change this to your desired color */
  border: 1px solid blue;
  box-sizing: border-box;
}

Attempt at half a circle:

That didn’t work:

border-bottom: 1px solid black;

https://jsfiddle.net/y7ozkfL2/

attmpt

<div class="half-circleA"></div>
       <div class="btn-wrap">
  <button class="exitE" type="button" title="Exit" aria-label="Exit"></button>
</div>
.half-circleA {
  z-index: 1;
  position: relative;
  top: 3px;
  left: 0;
  bottom: 0;
  right: 0;
  margin: auto;
  width: 57px;
  height: 30px;
  background-color: transparent;
  border-top-left-radius: 110px;
  border-top-right-radius: 110px;
  border: 1px solid blue;
  border-bottom: 1px solid black;
}