Untitled

<!DOCTYPE html>
<html><head>
<title>screen test</title>
</head>
<body>
<style>
* {
  margin: 0;
}
#output {
  width: 100%;
  height: 100%;
}
table {
  border: 0px;
  border-collapse: collapse;
  border-spacing: 0px;
  display: table;
}
table td {
  padding: 0px;
}
.cell {
  color: black;
}
#content {
  width: 3000px;
  height: 100%;
}
.row {
  height: 20px;
  width: 3000px;
}
.column {
  height: 20%;
  width: 600px;
}
</style>
<table id="content">
<tr class="row row1">
<td class="column column1 cell" id="cell11">&nbsp;</td>
<td class="column column2 cell" id="cell12">&nbsp;</td>
<td class="column column3 cell" id="cell13">&nbsp;</td>
<td class="column column4 cell" id="cell14">&nbsp;</td>
<td class="column column5 cell" id="cell15">&nbsp;</td>
</tr>
<tr class="row row2">
<td class="column column1 cell" id="cell21">&nbsp;</td>
<td class="column column2 cell" id="cell22">&nbsp;</td>
<td class="column column3 cell" id="cell23">&nbsp;</td>
<td class="column column4 cell" id="cell24">&nbsp;</td>
<td class="column column5 cell" id="cell25">&nbsp;</td>
</tr>
<tr class="row row3">
<td class="column column1 cell" id="cell31">&nbsp;</td>
<td class="column column2 cell" id="cell32">&nbsp;</td>
<td class="column column3 cell" id="cell33">&nbsp;</td>
<td class="column column4 cell" id="cell34">&nbsp;</td>
<td class="column column5 cell" id="cell35">&nbsp;</td>
</tr>
<tr class="row row4">
<td class="column column1 cell" id="cell41">&nbsp;</td>
<td class="column column2 cell" id="cell42">&nbsp;</td>
<td class="column column3 cell" id="cell43">&nbsp;</td>
<td class="column column4 cell" id="cell44">&nbsp;</td>
<td class="column column5 cell" id="cell45">&nbsp;</td>
</tr>
<tr class="row row5">
<td class="column column1 cell" id="cell51">&nbsp;</td>
<td class="column column2 cell" id="cell52">&nbsp;</td>
<td class="column column3 cell" id="cell53">&nbsp;</td>
<td class="column column4 cell" id="cell54">&nbsp;</td>
<td class="column column5 cell" id="cell55">&nbsp;</td>
</tr>
</table>
<script>
function toColor(num) {
  num >>>= 0;
  var b = num & 0xFF,
    g = (num & 0xFF00) >>> 8,
    r = (num & 0xFF0000) >>> 16;
  return "rgb(" + [r, g, b].join(",") + ")";
}
var initialColor = 0x0F0F0F;
var stepColor = 1000;
var cnt = 1;
for (var i = 1; i < 6; i++) {
  for (var j = 1; j < 6; j++) {
    el = document.getElementById('cell' + i + '' + j);
    el.style.backgroundColor = toColor(initialColor + (cnt * stepColor));
    cnt++;
  }
}
</script>
</body>
</html>