Find this in your stylesheet:```
#headerWrapper, #contentMainWrapper, #logoWrapper, #cartBoxListWrapper, #ezPageBoxList, #cartBoxListWrapper ul, #ezPageBoxList ul, #mainWrapper, #popupAdditionalImage, #popupImage {
margin: 0em;
padding: 0em;
width: 720px;
}
You need to separate those selectors into two lists, one with the width and one without. Decide which elements you really want to be that wide.
"em" is a measurement relating to font size. It essentially is a width equivalent to an "m" character in the particular font; for general Zen Cart purposes, the base font is 10px high and an em is 10px - this makes converting between em and px easy. In places where you have different size text, an em may be a different size also. This helps when making page layouts that allow users to display larger fonts for reading without destroying the layout - the whole layout will expand with the text.