.wrapper{
  text-align: center;
  background-image: url("http://www.mulierchile.com/army-camo-background/army-camo-background-014.jpg");

  width: 50%;
  display: inline-block;
  margin: auto;
}

#input{
  font-size: 24px;
  margin-top: 1%;
}

#result{
  font-size: 24px;
  margin-top: 1%;
  margin-bottom: 1%;
}

#submit{
  font-size: 24px;
  margin-left: 1%;
}

#header{
  margin-top: 10%;
  padding-top: 5%;
  color: white;
}