That negative error is showing the overflow when you tried uploading an image and reached the max total space.
total space left - image size
Your image might be/get corrupted when uploaded (happens with unstable connections).
You can use that code for the banner image (change the height values to match your banner image's height)
.subbanner { background-color: #000 !important; background: url(%%mybanner%%) no-repeat center/contain; width: 100%; height: 234px; }
.subbannerm { background-color: #000 !important; background: url(%%mybanner%%) no-repeat center/contain; height: 4.05em; width: 100%; margin-bottom: -0.1em; margin-top: -0.3em; }
.submenumargin { padding-top: 3em !important; }
(post is archived)