Some more tweaking, I'd call it beta now. ...or an MVP ;)

lektor/lektordata/project/assets/static/style.css

@@ -105,9 +105,14 @@ div.page {
     background: #fafafa
 }
 
+.inner_page.bgimage .image img {
+    width: 283.66px
+}
+
 @media (max-width:768px) {
     div.inner_page.bgimage {
-        min-height: calc((80vw - 60px)*.572)
+        background-image: none;
+        min-height: 0
     }
 
     body {
@@ -121,12 +126,28 @@ div.page {
     footer {
         font-size: 2vw
     }
+
+    .inner_page.bgimage .image img {
+        width: 80%
+    }
 }
 
 @media (min-width:1025px) and (max-width:1540px) {
     div.inner_page.bgimage {
         min-height: calc((80vw - 60px)*.572)
     }
+
+    body {
+        font-size: 1.5vw
+    }
+
+    header {
+        font-size: 1.25vw
+    }
+
+    footer {
+        font-size: 1vw
+    }
 }
 
 @media (min-width:769px) and (max-width:1024px) {
@@ -145,4 +166,8 @@ div.page {
     footer {
         font-size: 1.75vw
     }
+
+    .inner_page.bgimage .image img {
+        width: 150px
+    }
 }

lektor/lektordata/project/content/contents.lr

@@ -1,6 +1,8 @@
 title: Willkommen beim Pistolenclub Stammertal!
 ---
 body:
+
+ <br/>
 <div class="image"><img src="/pc-stammertal-logo-minimal.svg"></div>
 ---
 _template: title_page.html