Custom background for separate survey pages

I am using the following code to customize the background on specific survey pages. It works, but when the questions are long enough, the background color stops mid-screen and doesn't continue down to cover the full background. Is there another object I should be specifying for the background?
Qualtrics.SurveyEngine.addOnload(function()
{
jQuery(".Skin" ).css({
"background":"#F7EDE2"
});

});