WPyogi on "[Theme: Twenty Eleven] Div Not Fully Responsive in 320 x 480"

It looks pretty good to me, but the CSS is not identical as the HTML is not either - the home page is using this:

.singular #primary {
    margin: 0;
}
#primary {
    float: left;
    margin: 0 -26.4% 0 0;
    width: 100%;
}

The blog page this:

#primaryblog {
    float: left;
    max-width: 100%;
    padding-left: 15px;
    width: auto;
}

So that looks like the padding-left is the likely difference?