#kernwaarden {
  width:100%;
  aspect-ratio:1 / 1;
  border-radius:50%;

  box-shadow:
    inset 0px 0px 0px 20px var(--green),
    inset 0px 0px 0px 40px var(--yellow),
    inset 0px 0px 0px 60px var(--orange),
    inset 0px 0px 0px 80px var(--blue);
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:90px;
  max-width:300px;
  margin:0px auto;
}

  #kernwaarden .tab-link {
    line-height:0;
  }