By increasing the size of the “positive” CTA button, particularly in the teaser step, we believed the added emphasis would improve visibility and nudge more users toward conversion. Boosting both email and SMS opt-in rates.

An A/B test was conducted across several brands’ popups to assess the impact of enlarging the positive action button. Two versions were tested:

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Visitors were randomly assigned to:

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• A control group experiencing the default CTA sizing, or
• A variant group shown a popup with a larger, more prominent positive button.


The variant outperformed the control in most cases:

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While one brand showed a decline, the majority of results leaned positive.

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Enlarging the “positive” CTA button showed consistent gains in most tests, particularly on the teaser step where visual cues matter most. This small visual adjustment helped tilt user attention and decision-making toward conversion.The takeaway: making the preferred path more visually dominant can boost performance. It's a simple, scalable nudge that works. Though be sure it aligns with overall design harmony and doesn’t overwhelm the user experience.