<!DOCTYPE html> <html lang="en"> <meta charset="utf-8"> <title>Both divs should be part of opaque layers.</title> <style> .content { box-sizing: border-box; width: 200px; height: 200px; border: 1px solid black; } .fixed { position: fixed; top: 20px; left: 140px; } .opaque-background { background-color: white; } body { height: 4000px; } </style> <div class="content reftest-opaque-layer"></div> <div class="fixed opaque-background content reftest-opaque-layer"></div>