On PC screen, item.size makes a zigzag down the center of the screen. A possible fix is to remove </span><span> from in-
replace li span {margin-left:auto}
with li a+span {margin:0px 10px 0px auto}
Edit:
perhaps this line is not needed:it's for upload progress
#upload {width:74px; background: no-repeat -74px linear-gradient(#cde,#cde), #f0f0f0; transition:none}
N/A is displayed as file size for virtual folder. Need blank instead of N/A. (I didn't figure out how to do that)will be fixed in next version
Edit:
the #FFF0D4 gradient background is nice
you have two more themes, if you set OS color to light
what is margins="0" in the body tag?