style.scss

* {
  box-sizing: border-box;
}
body {
  background-color: #8ECB9E;
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
}
h1,
.attempts {
  text-align: center;
}
.board {
  max-width: 700px;
  margin: 30px auto;
}
.tile {
  background-color: rgba(#fff,.5);
  width: 23%;
  float: left;
  padding: 50px 0;
  margin: 1%;
  text-align: center;
  font-size: 40px;
  cursor: pointer;
}