Add the following to the page that is producing the SlickGrid.
<style>
html, body {
margin: 0;
padding: 0;
background-color: white;
overflow: auto
;}
body {
font: 11px Helvetica, Arial, sans-serif
;}
.fill_browser {
position: absolute;
top: 40px;
left: 0;
right: 0;
bottom: 0
;}
</style>
<div id="#MyGrid" class="fill_browser"></div>