Resize box shows up in P tag with CKEditor in IE

P tags in CKEditor using IE show up with a resize box, even if they are empty. This seems to be because there is a min-width set on the tag, explained here:

http://stackoverflow.com/questions/18976267/ckeditor-ie-resizable-frame-...

Removing the max-width using developer tools seems to fix the issue. The code is question is located at line 16 of sass/style.scss:

p,
blockquote,
pre,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
nav,
section,
summary,
dt,
dd,
li {
  max-width: $line-length-normal;
}