Fix FMI logo on front page

Author: t-sommer

content/_index.html

@@ -38,7 +38,7 @@
 
       {{< latest-news >}}
 
-      <div class="fmi-masthead-logo d-block mx-auto" style="width: 450px; max-width: 80%;"></div>
+      <div class="ma-logo fmi-logo masthead-logo d-none d-sm-block mx-auto mt-5 mb-5" style="height: 180px"></div>
 
       <h1 class="mb-4">The leading standard to exchange dynamic simulation models</h1>