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How to Fix Outlook Button Border Collapsing in Outlook 2016
for Klaviyo Campaigns

A programmatic integration guide for resolving email rendering crashes inside Outlook 2016 using Klaviyo's layout editor environment.

Root Bug Analysis

Standard HTML CSS border-radius is completely ignored by Microsoft Word (Outlook 2016). When a rounded button is compiled using borders and padding on an anchor tag, Outlook renders a square box and collapses the clickable area.

Active rendering engine: Microsoft Word (MSO)

Klaviyo Specific Guide

Klaviyo's default buttons use custom wrapper cells that Outlook strips. To guarantee rounded buttons inside Outlook, generate a hybrid VML (Vector Markup Language) roundrect structure overlaid with normal HTML tables.

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: Standard border-radius properties are ignored. Custom shapes require VML roundrect markup tags or hybrid table cells with explicit background fills.

Interactive Klaviyo Custom Sandbox

Target Environment: Outlook 2016

Auto-compile fixes inside RenderOps Workspace

Load layout code directly into our VML Button Builder to compile responsive table frameworks that display cleanly in Outlook 2016.

Launch VML Button Builder

Fix Outlook Button Border Collapsing on Other clients for Klaviyo