html {
  font-family: "Roboto", sans-serif;
}

h1 {
    color: #f4f4f4;
  text-align: center;
  font-size: 3rem;
  margin-top: 100px;
}

#tiles {
  width: 300px;
  margin-left: auto;
  margin-right: auto;
  margin-top: 50px;
  position: relative;
  background-color: white;
  padding: 8px;
  border-radius: 0.5rem;
}

.selected {
  background-color: #ededed;
  border: none;
  color: white;
}

.btn {
  font-size: 24px;
  height: 100px;
  width: 100px;
  cursor: pointer;
  border-radius: 0;
  border-width: 0;
  color: rgba(0, 0, 0, 0);

  background-size: 300px 300px;
}