First, what page are you trying to embed that search form into? Please share a published URL to it if you want custom CSS help.
Second, does your designer take a long time to load? 250 MB of assets might be the reason!
When using the CMS to display images from a collection, it is best to create a thumbnail to use on listing pages and then an optimized version for the detail page. 2+MB per image in the collection is a performance killer.
