Catch Inspire displays incorrectly in Internet Explorer

Hello, It looks like IE is not honoring the CSS layout for Catch Inspire theme. Please see: https://mapla.org/conference-registration https://mapla.org/conference-hotel/ I've updated the theme; also, based on another thread with a similar issue, I tried adding the following Additional CSS: #wp-custom-header img { height:100%; } Any help will be greatly appreciated!