#themes {
  position: sticky;
  bottom: 10px;
}

button {
  width: 50px;
  height: 50px;
  border-radius: 15%;
}

#default {
  border-color: black;
  background-color: white;
}

#black {
  border-color: white;
  background-color: black;
}

#caramel {
  border-color: darkred;
  background-color: khaki;
}

#dark {
  border-color: white;
  background-color: darkslateblue;
}