Fixing bg image on all pages issue

main-site/themes/temper/static/css/style.css

@@ -1,9 +1,12 @@
 body {
-  /* background-color: #212121; */
-  background-image: url("/img/bg.png");
+  background-color: #212121;
   font-family: 'Courier New', monospace;
   color: #dcdcdc;
 }
+.main-page {
+  background-image: url("/img/bg.png");
+}
+
 html { 
   scroll-behavior: smooth;
   display: flex;