Fix mobile responsiveness (#12)

This commit updates 'css/landing.css' to fix a layout overflow on mobile
devices.

Author: igorstalmach

src/supplemental-ui/css/landing.css

@@ -95,7 +95,7 @@ body {
 }
 
 .logos {
-    min-width: 400px;
+    min-width: 370px;
 }
 
 .logos img[alt~="logo"] {
@@ -117,7 +117,7 @@ body {
     }
 
     .hero-duo > div {
-        max-width: unset;
+        max-width: 390px;
     }
 
     .secondary {