umami/components/buttons/ThemeButton.module.css

.button {
  width: 50px;
  height: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
}

.button > div {
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
}