Fixed center of header again (better solution)

inc/css/main.css

@@ -70,6 +70,13 @@ a:hover {
     color: var(--c3);
 }
 
+nav {
+    position: absolute;
+    height: 100%;
+    width: 100%;
+    margin-top: -1.5vh;
+}
+
 #logo {
     position: relative;
     height: auto%;
@@ -78,8 +85,6 @@ a:hover {
 #logo img {
     filter: grayscale(1);
     width: calc(var(--h-header) + 3vh);
-    margin-top: -1.5vh;
-    margin-bottom: -1.5vh;
 }
 
 #logo img:hover {