.col-one {
  background-color: aqua;
  padding: 20px;
}

.col-two {
  background-color: lightcoral;
  padding: 20px;
}

.col-three {
  background-color: lightgreen;
  padding: 20px;
}

body {
  font-family: Arial, sans-serif;
}

h1 {
  color: darkgreen;
}