body {
  background-color: white;
  color: black;
 }

h1 {
  font-size: 50px;
  color: black;
}

h2 {
  font-size: 25px;
  color: black;
}

big-key{
border:1px solid gray;
font-size:1.2em;
color: black;
box-shadow:1px 0 1px 0 #eee, 0 2px 0 2px #ccc, 0 2px 0 3px #444;
-webkit-border-radius:3px;
-moz-border-radius:3px;
border-radius:3px;
margin:2px 3px;
padding:1px 5px;
}