Swap WordPress Preloader Icon

I need the default preloader on my astrologer-themed WordPress site removed entirely and replaced with a simple icon that I will supply. The new icon should appear centered on the screen while the page loads, just as the current animation does now, and then disappear seamlessly once the content is ready.

The site runs on a standard WordPress install with a premium astrology template; no core files should be edited—please work through the child theme or custom-code snippets in functions.php and CSS/JS as appropriate. I’ll send you the PNG/SVG icon file as soon as we start.

Acceptance criteria:
• Existing preloader fully disabled (no flicker or residue code).
• My supplied icon displays in the exact center during load, scales correctly on mobile and desktop, and vanishes on page render.
• All other site functionality and performance remain untouched.

A quick turnaround is appreciated, and I’m happy to test changes on a staging copy or provide temporary admin access—whichever you prefer.