html - How to make a doughnut segment using only CSS

Question

How to make this shape use only css

What I have tried:

.button-up {
  border-top: 100px solid red;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
  border-top-left-radius: 50%;
  border-top-right-radius: 50%;
  border-bottom: 35px solid transparent;
  width: 200px;
}

<div class="button-up"></div>

Answer 1

I would go with some linear/radial-gradient like this:

.box {
  width:200px;
  height:200px;
  border-radius:50%;
  background:
   linear-gradient(-30deg, white 50%,transparent 50.5%),
   linear-gradient(30deg,  white 50%,transparent 50.5%),
   radial-gradient(farthest-side at center,transparent 40%,blue 41%);
}

<div class="box">

</div>