* {
  position: relative;
}

body,
html {
  width: 100%;
  height: 100%;
  overflow: hidden;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
}
.button {
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: darkblue;
  border: 1vmin solid black;
}

.circle {
  width: 50vmin;
  height: 50vmin;
  border-radius: 50%;
}

.circle span {
  color: white;
  font-weight: 800;
  font-family: sans-serif;
  font-size: 13vmin;
}

.bg {
  position: absolute;
  background: white;
  opacity: 0.3;
  will-change: transform;
}