If you are trying to modify the code from the link, all you need to do is modify the css:
#container1 {
float:left;
width:100%;
}
#col1 {
float:left;
width:50%;
background:red;
}
#col2 {
float:left;
width:50%;
background:yellow;
}
And I would declare your background color as a hex value and in the container itself, unless of course you want two different color backgrounds for your columns.
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