This edit area has always been a tad problematic wrt sizing. With flex box supported so widely, we should use that instead.
.prp-page-container { width: 100%; display: flex; flex-wrap: wrap; } .prp-page-content { flex: 1 1 auto; min-width: 15em; display: flex; flex-direction: column; } .prp-page-edit-header, .prp-page-edit-footer { flex: 0 1 auto; } .prp-page-edit-body { flex: 1 1 auto; } .prp-page-image { flex: 0 1 auto; }