.container {
  display: table;
  grid-template-columns: auto auto auto;
  background-color: dodgerblue;
  padding: 10px;
}
.container div {
  background-color: #f1f1f1;
  border: 1px solid black;
  padding: 10px;
  font-size: 30px;
  text-align: center;
}
body {
  background-image: url("websitetiles.png");
  background-size: 30%;
  color: black;
  font-family: Verdana;
}