body { 
  color: black;
  background: white;
  margin-left: 10%;
  margin-right: 10%;
}

h1 { 
  margin-left: -8%;
}

h2,h3,h4,h5,h6 { 
  margin-left: -4%;
}

p.warning { 
  color: red;
  background: lightyellow;
  font-family: Verdana, sans-serif;
  font-size: 125%;
  font-weight: bold;
  text-align: center;
}

div.box {  
  border: solid; 
  border-width: thin; 
  width: 100% 
}