diff --git a/static/css/custom.css b/static/css/custom.css
index a250092..fcb833d 100644
--- a/static/css/custom.css
+++ b/static/css/custom.css
@@ -1,26 +1,8 @@
 body {
-    background-color: #f5f7fa;
-    position: relative;
-}
-
-body::before {
-    content: '';
-    position: fixed;
-    top: 0;
-    left: 0;
-    width: 100%;
-    height: 100%;
-    z-index: -1;
-    opacity: 0.15;
-    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='600' height='400' viewBox='0 0 600 400'%3E%3Ctext x='50' y='60' font-family='serif' font-size='20' fill='%23003366'%3E∫₀^∞ e^(-x²) dx%3C/text%3E%3Ctext x='350' y='120' font-family='serif' font-size='20' fill='%23003366'%3E∇²ψ + k²ψ = 0%3C/text%3E%3Ctext x='100' y='200' font-family='serif' font-size='20' fill='%23003366'%3EE = mc²%3C/text%3E%3Ctext x='400' y='280' font-family='serif' font-size='20' fill='%23003366'%3E∂u/∂t = α∇²u%3C/text%3E%3Ctext x='200' y='350' font-family='serif' font-size='20' fill='%23003366'%3EΣ aₙxⁿ%3C/text%3E%3Ccircle cx='500' cy='80' r='30' fill='none' stroke='%23003366' stroke-width='1.5'/%3E%3C/svg%3E");
+    background-image: url('/static/images/bg-phys.svg');
     background-repeat: repeat;
-    background-size: 600px 400px;
-}
-
-/* Убедимся, что контент читается */
-header, main, footer {
-    position: relative;
-    z-index: 1;
+    background-size: 800px 600px;
+    background-attachment: fixed;
 }