Your Organization has added a Header Image in the Website Design section of your Kintera Thon event, when using the Essentials template; however, in Chrome and Safari the Header Image is not resizing properly.
Update the original size of the image to be exactly 140 X 96 and re-upload the image. This should keep it from resizing to a larger image.
Steps to Duplicate
Navigate to Communities > Special Events > Friends Asking Friends > Kintera Thon
Hover over your Kintera Thon event and click Website Info
Click Website Design
Under Header Logo click Add/Remove image for Header Logo
Submit an image
Navigate back to the Web Info checklist and click the green Publish This Event Now button
View the URL for the page in Chrome or Safari
Notice that the image is very large and not resizing properly