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How to Fix CSS Grid Broken Columns in Gmail Web (Desktop)
for Mailchimp Campaigns

A programmatic integration guide for resolving email rendering crashes inside Gmail Web (Desktop) using Mailchimp's layout editor environment.

Root Bug Analysis

CSS Grid is unsupported in Gmail Webmail, causing columns to stack vertically on desktop screens.

Active rendering engine: Goog/WebKit Layout Engine

Mailchimp Specific Guide

Mailchimp template inliner strips classes from header styles. Inlining column width elements is required.

Integration Step:

Locate your campaign block inside Mailchimp. Drag a 'Code' block into your canvas workspace. Toggle the editor view to Source, paste the optimized code, and click Save.

ESP Unsubscribe Alignment

When compiling custom HTML templates for Mailchimp, you must ensure your layout retains deliverability compliance loops. Mailchimp requires you to insert their specific unsubscribe merge tag, otherwise your campaign delivery will be flagged by automated spam audits.

Mailchimp Unsubscribe Tag:*|UNSUB|*

Documented Client Behavior

Expected layout behavior based on target rendering engine specifications:

Documented behavior: CSS grid specifications are stripped or ignored by Gmail Web browser viewports. Layouts must be structured using floating tables.

Interactive Mailchimp Custom Sandbox

Target Environment: Gmail Web (Desktop)

Paste Your Broken Code

<div style="display: grid; grid-template-columns: 1fr 1fr; gap: 10px;">
  <div>Col 1</div>
  <div>Col 2</div>
</div>

RenderOps Compiled Output

<!-- Paste code on the left and click compile to output clean fallback tags -->

Auto-compile fixes inside RenderOps Workspace

Load layout code directly into our Flexbox→Table Compiler to compile responsive table frameworks that display cleanly in Gmail Web (Desktop).

Launch Flexbox→Table Compiler

How to Fix CSS Grid Broken Columns in Gmail Web (Desktop) for Mailchimp Campaigns