CRO Manifesto
Make the Checkout CTA Loud, Clear & Sticky
context
If users have to scroll to find the Checkout button, they may get distracted or second-guess their purchase, creating unnecessary barriers to completing a purchase.
Why?
Make the checkout button bold, high-contrast, and always visible. If the cart is scrollable, use a sticky checkout button that stays accessible at all times. Removing friction ensures a seamless path to conversion.
Content
This optimization is critical if your cart page creates barriers to checkout completion:
- Cart abandonment rate above 70% (industry average is 69.8%)
- Analytics show high bounce rates specifically on cart pages (above 40%)
- Your cart requires scrolling to see checkout button, especially on mobile devices
- You're using Shopify, WooCommerce, or custom checkout with scrollable cart sections
- Monthly traffic exceeds 1,000 visitors (sufficient data to measure impact within 2-3 weeks)
Transform your checkout button into a conversion-driving sticky element with these specific steps:
- Shopify Implementation: Navigate to Online Store > Themes > Actions > Edit Code. Locate your cart template file (usually
cart.liquidorcart-drawer.liquid) - Add Sticky CSS: Insert this code in your theme's CSS file:
.sticky-checkout {
position: sticky;
bottom: 0;
background: #fff;
padding: 20px;
border-top: 1px solid #e5e5e5;
z-index: 1000;
} - Button Specifications: Make your CTA button minimum 48px height, full-width on mobile, with high contrast colors (dark button, white text, or your brand's highest contrast combination)
- Mobile Priority: Test on devices with viewport heights below 667px where stickiness matters most
- Implementation Time: 2-4 hours for basic sticky functionality, additional 2 hours for mobile optimization and cross-browser testing
Track these metrics to validate your sticky CTA's impact:
- Cart-to-checkout conversion rate: Expect 8-15% improvement within 2-4 weeks
- Cart abandonment rate: Target 5-10% reduction from your baseline
- Time spent on cart page: May initially increase as users engage more with sticky element
- Mobile checkout completions: Monitor using Google Analytics' device category reports, expecting 10-20% mobile improvement
- AVOID: Making sticky elements too tall (over 80px) that block cart content view. BEST PRACTICE: Keep sticky checkout bar under 60px height with minimal padding
- AVOID: Using low-contrast colors that blend with your background. BEST PRACTICE: Test color contrast ratios above 4.5:1 for accessibility and visibility
- AVOID: Implementing sticky behavior on desktop-only. BEST PRACTICE: Prioritize mobile-first sticky implementation where screen real estate is most limited
- AVOID: Covering important cart information with sticky elements. BEST PRACTICE: Add bottom padding to cart content equal to your sticky element's height
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