body {
  display: grid;
  text-align: center;
  place-items: center;
  background-color: #000;
  color: white;
}
a {
  color: aliceblue;
}

.meowworld, .hexacolor, .uranium {
  background-color: darkgrey;
  padding: 20px;
  border-radius: 10px;
  border: 5px solid grey;
}