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Outlook Email Broken Layout Fix: Resolve CSS Grid Broken Columns

A programmatic integration guide for resolving email rendering crashes inside Outlook Office 365 (Web) using Klaviyo's layout editor environment.

Root Bug Analysis

Outlook O365 Web App has zero support for CSS Grid declarations, causing elements to stack.

Active rendering engine: Office Rendering Service

Klaviyo Specific Guide

Klaviyo templates require inline formatting widths. You must convert grid wrappers to Outlook-safe table layouts.

Integration Step:

Open your Klaviyo template editor. Drag an 'HTML' block directly into your layout timeline (do not use a standard text box). Clear the default skeleton content inside the Klaviyo markup editor and paste the RenderOps corrected inline code.

ESP Unsubscribe Alignment

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

Klaviyo Unsubscribe Tag:{% unsubscribe %}

Documented Client Behavior

Expected layout behavior based on target rendering engine specifications:

Documented behavior: CSS grid is ignored in standard Outlook Web App browsers. Custom grids require mapping to percentages.

Interactive Klaviyo Custom Sandbox

Target Environment: Outlook Office 365 (Web)

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 Outlook Office 365 (Web).

Launch Flexbox→Table Compiler