body {
  height: 100%;
  width: 100%;
  background-color: black;
}

:root {
  font-family: "Josefin Sans", sans-serif;
  height: 100%;
  transition: 0.3s;
  width: 100%;
}

button {
  font-family: "Josefin Sans", sans-serif;
  -webkit-appearance: none;
  font-size: 40px;
  background: white;
  margin: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);

  padding: 100px;
  padding-top: 110px;
  padding-bottom: 110px;
  border: none;
  border-radius: 50%;
}
button:hover {
  background: lightgrey;
}