html {
 font-size: 10px;
 background: url('images/arnold-terminator.jpg') bottom center;
 background-size: cover;
}

body,html {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
}

.keys {
  display: flex;
  flex: 1;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
}

.key {
  border: .4rem solid black;
  border-radius: .5rem;
  margin: 1rem;
  font-size: 5rem;
  padding: 1rem .5rem;
  width: 10rem;
  text-align: center;
  color: rgba(200,0,0,1);
  background: rgba(255,255,255,0.1);
  text-shadow: 0 0 .5rem white;
}

@font-face {
  font-family: Terminator;
  src: url('fonts/terminator.ttf');
}

html {
 font-size: 10px;
 background: url('images/arnold-terminator.jpg') bottom center;
 background-size: cover;
}

body,html {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
}

kbd {
  font-family: Terminator;
}

.keys {
  display: flex;
  flex: 1;
  min-height: 100vh;
  align-items: flex-end;
  justify-content: center;
}

.key {
  border: .4rem solid rgba(100,100,100,1);
  border-radius: 2rem;
  margin: 1rem;
  font-size: 5rem;
  padding: 1rem .5rem;
  width: 10rem;
  text-align: center;
  color: rgba(200,0,0,1);
  background: rgba(255,255,255,0.15);
  text-shadow: 0 0 1rem white;
}

Add terminator font-face to css
Add terminator font-face to css
