2010, 2013, Office 365, SharePoint, Web Design
SharePoint image max-width in IE and FireFox not working
So you have an image that is styled to max-width: 100% but it displays at its native width and pushes over your other content.
max-width: 100% works well in Chrome, but IE and Firefox (and potentially some other browsers) don’t honor it.
This article explains why and how to fix it.