Update funder background color for improved visibility

Author: grafische-republiek

sass/components/partners.scss

@@ -49,7 +49,7 @@
 .funder {
   align-items: center;
   justify-content: start;
-  background-color: rgba(255,255,255,0.85);
+  background-color: rgba(255,255,255,0.25);
   display: flex;
   justify-content: center;
   gap: 0.75rem;