I've created a landing page and the mobile version is a mess. I reached out to HubSpot support and they tried cloning the page and then putting the header into a table...that didn't fix it.
I reached out to the designer of the template (I purchased it from InboundPixels) and he is on vacation. I've gone through reference guides and I can't figure out what to do.
Save yourself future grief and go with a HubSpot certified template team -- Brand Builder Solutions, or custom designer.
We decided long ago to never (ever) use HubSpot products / services unless they were produced by verified HubSpot certified teams. Simply not worth the headache.
Just a thought. Hope it helps.
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Ran across this article from the guys at Databox (a HubSpot integration partner). In it, Joe Jerome, the CEO of Brand Builder Solutions gives a step-by-step roadmap about what to look for when having templates developed on the HubSpot platform.