First, the page width is a little too big. On 1024x600 resolution there is a horizontal scrollbar, which seems kind of useless to me and takes up vertical space.
Secondly, the link named Feedback on https://www.instructables.com/about/contact.jsp directs to https://www.instructables.com/community?categoryGroup=help&category=faq, as does the link named FAQs on the Contact Instructables page.
Third, a button to hide the search header would be a nice feature, it's unnecessarily big and takes about 1/6th of vertical space on resolution of 1024x600.
I hope I explained understandably and that you can make some tweaks.
Windows 7 Home Premium