screen.css

* { 
  margin: 0; 
}
html, body, #output {
  width: 100%;
  height: 100%;
}
table {
  border: 0px;
  border-collapse: collapse;
  border-spacing: 0px;
  display: table;
}
table td {
  padding: 0px;
}
.cell {
  color: black;
}