Improve the splash screen

Author: GuidoBR

frontend/src/pages/Auth/Splash/SplashPage.scss

@@ -9,6 +9,7 @@
     justify-content: center;
     position: relative;
     overflow: hidden;
+    background-color: #101828; /* Dark background color as fallback */
   }
 
   &__background {
@@ -26,7 +27,7 @@
     flex-direction: column;
     align-items: center;
     justify-content: center;
-    z-index: 1;
+    z-index: 2; /* Increased z-index to appear above the overlay */
     padding: 2rem;
     animation: fade-in 1s ease-in;
   }