fix: header over browser scrollbar

assets/scss/docsy_overrides.scss

@@ -1,6 +1,7 @@
 .td-navbar {
     background: $dark;
     min-height: 5rem;
+    z-index: 15;
     .navbar-brand__name {
         display: none;
     }

content/en/_index.html

@@ -118,7 +118,6 @@ linkTitle = "SelfPrivacy"
 		</div>
 	</div>
 
-
 	<div class="w-100 mt-5 mb-3">
 		<h3 class="mx-auto text-center">For a good life</h3>
 	</div>
@@ -190,7 +189,7 @@ linkTitle = "SelfPrivacy"
 	<h2 class="mx-auto text-center">Supported by</h2>
 </div>
 
-<div class="container-fluid h-100">
+<div class="container-fluid">
 	<div class="sp-supported-by-list">
 		<a href="https://nlnet.nl/project/SelfPrivacy/" target="_blank" rel="noopener noreferrer">
 			<img class="sp-supported-by-img" src="/images/logos/nlnet.svg" alt="NLnet foundation">