* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
h1, p {
  background-color: #DDE0E3;    /* Light gray */
}

em, strong {
  background-color: #B2D6FF;
  display: inline;             /* This is the default for em and strong */
}
h1 {
  padding: 50px;
  border-bottom: 1px solid #5D6063;
}
p {
  padding: 20px 0 20px 10px;
  margin-top: 25px;
  margin-bottom: 50px;
}
div {
  color: #FFF;
  background-color: #5995DA;
  font-weight: bold;
  padding: 20px;
  text-align: center;
  border: 2px solid #5D6063;
  border-radius: 5px;
  width: 200px;
  box-sizing: border-box;  /* Add this */
  margin: 20px auto;
}
body {
  text-align: center;
}