body {
  margin: 20px 30px;
  font-size: 13px;
  font-family: 'Open Sans', Helvetica, Arial;
}
header{
  margin: 0 auto;
  background: cornsilk;
  padding: 5px;
  text-align: center;

}
a {
  color: #34A9DC;
  text-decoration: none;
}
.centerBox{
  
}
p {
  margin: 5px 0 20px;
}
#example{
  margin: 5% 0 5% 15%;
}
h2 {
  margin: 20px 0 0;
  font-size: 18px;
  font-weight: normal;
}
.box{
  margin: 0 auto;
  float: left;
  width: 50%;
}
@media screen and (max-width: 750px) {
  #example{
    margin: 0;
  }
    .box{
      width: 90%;
    }
}