feat(404): cleaned up 404 page

assets/scss/style.scss

@@ -18,6 +18,10 @@
   }
 }
 
+html, body {
+  height: 100%;
+}
+
 html {
   margin: 0;
   background: $background;
@@ -28,6 +32,9 @@ html {
   scroll-behavior: smooth;
 }
 
+body {
+  margin: 0;
+}
 
 body,
 button,
@@ -350,6 +357,11 @@ table {
   }
 }
 
+#spotlight.error-404 > #home-center {
+  align-self: center;
+  flex-direction: row;
+}
+
 p.img-404 {
   margin: 0;
 
@@ -898,8 +910,10 @@ a.footnote-ref {
   }
 
   #spotlight.error-404 {
-    flex-direction: column;
+    flex-direction: row;
+    flex-grow: 1;
     text-align: center;
+    align-self: center;
 
     .banner-404 {
       margin: 0;