Issue 5135 - Reduce font size and padding on smaller screens on acceptableads.com

includes/tool-certification/summary.md

 # {{acceptable-ads-tool[Acceptable Ads Tool Heading] <fix>Acceptable Ads</fix> Certification Tool}} <small>({{beta-label[beta label placed after heading] beta}})</small>
 
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 **{{reach-millions[Acceptable Ads Tool Subheading] Reach millions of ad-blocking users with pre-approved ads and one-tag implementation in minutes.}}**
 
 {{adblock-plus-and-combotag[Acceptable Ads Tool paragraph 1] Adblock Plus teamed up with ComboTag to create the first real-time open Certification Tool for Acceptable Ads. This allows publishers to drag-and-drop *pre-approved* [Acceptable Ads](https://acceptableads.com/about/criteria) directly onto their sites. In seconds.}}
 
 {{ads-dont-have-to-be-annoying[Acceptable Ads Tool paragraph 2] Ads don’t have to be annoying - even if you’re pushing for increased engagement, viewability and yield. Millions of users have installed ad blockers in what could be the greatest consumer revolt of all time; there is a way to win those picky users back with nonintrusive ads.}}
 
 {{adblock-plus-getting-users-back[Acceptable Ads Tool paragraph 3] Adblock Plus has been getting these users back with the Acceptable Ads initiative. The secret of the initiative is trust: users don’t have to take part, but because it’s on their own terms, most do. And yet, after over five years of existence, it was still a labor-intensive process for publishers and advertisers to join.}}
 
 {{acceptabl-ads-tool-wins[Acceptable Ads Tool paragraph 4] Not anymore. The Acceptable Ads Certification Tool (AACT) is an open infrastructure that validates Acceptable Ads and facilitates them being served using tools common to the ad tech industry.}}
 
 ## {{easy-implementation[Easy Implementation Heading] Easy implementation optimized for your audience}}
 
 {{see-pre-approved-ads[Easy Implementation paragraph 1] You can use pre-approved ads from various demand channels, or you can use your own and let the AACT check them in real-time against the Acceptable Ads criteria. The implementation is simple, intuitive and includes a unique user feedback mechanism, which lets you optimize your ads for your specific user base.}}
 
-[{{sign-up-label[Sign Up button label] Sign Up}}](https://platform.acceptableads.me/signup){: .btn-primary .m-t-sm .m-b-xl target="blank" }
+[{{sign-up-label[Sign Up button label] Sign Up}}](https://platform.acceptableads.me/signup){: .btn-primary target="blank" }
+{: .btn-container }