page {
  background-color: darkgray;
}

label {
  left:        0;
  top:         80;
  color:       white;
  height:      80;
  width:       320;
  font-size:   80;
  text-align:  right;
}

button {
  width:         79px;
  height:        79px;
  color:         black;
  background:    white;
  border-radius: 0px;
  font-size:     40;
}

button.double { width: 159; }
button.ops    { background: yellow; font-size: 20; }
button.top    { background: lightgray; font-size: 20; }

.row1 { bottom: 0px;   }
.row2 { bottom: 80px;  }
.row3 { bottom: 160px; }
.row4 { bottom: 240px; }
.row5 { bottom: 320px; }

.col1 { left: 0;   }
.col2 { left: 80;  }
.col3 { left: 160; }
.col4 { left: 240; }