body {
  text-align: center;
  background-image: url("https://images.unsplash.com/photo-1568145675395-66a2eda0c6d7?ixid=MnwxMjA3fDB8MHxzZWFyY2h8MXx8d2F0ZXIlMjB0ZXh0dXJlfGVufDB8fDB8fA%3D%3D&ixlib=rb-1.2.1&w=1000&q=80");
}


#text {
  color: black;
  padding: 15px;
  font-size: 30px;
  margin-right: 20px;
  margin-left: 20px;
  text-decoration: underline;
  font-family: Monospace, Lucida Console;
}

#sum {
  font-family: Monospace, Lucida Console;
  font-size: 24px;
}

.box {
  border: 2px solid black;
  padding: 15px;
  text-align: center;
  margin: 20px;
} 

.lightblue {
  background-color: lightblue;
}

.yellow {
  background-color: yellow;
}