.circlegraph {
  position: relative;
  width: 500px;
  height: 500px;
}

.circlegraph:before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  border: 2px solid teal;
  width: calc( 100% - 2px * 2);
  height: calc( 100% - 2px * 2 );
  border-radius: 50%;
}

.circlegraph .circle {
  position: absolute;
  top: 50%; left: 50%;
  width: 100px;
  height: 100px;
  margin: calc( -100px / 2 );
  background: teal;
  border-radius: 50%;
}

.center{
  display: flex;
  justify-content: center;
  align-items: center;
}