Add WIP custom background video feature

src/scss/index.scss

@@ -83,6 +83,7 @@ body {
     from {
         opacity: 0;
     }
+
     to {
         opacity: 1;
     }
@@ -100,4 +101,12 @@ body {
 
 ::selection {
     background-color: #c2c2c2;
+}
+
+#backgroundVideo {
+    position: fixed;
+    right: 0;
+    bottom: 0;
+    min-width: 100%;
+    min-height: 100%;
 }