html,
head,

body {background-color: darkgray;}

div {
  width: 300px;
  border: 15px darkred;
  padding: 50px;
  margin: 20px;
}

/*Change on a specific elements*/
#container .child1{
  font-family:  cursive;
  font-size: 2rem;
  color: white;   
  text-align:center;
  background-color: blue;
}