Use max-width instead of width

Author: Guts

content/theme/assets/stylesheets/extra.css

@@ -50,7 +50,7 @@ img {
   display: block;
   margin-left: auto;
   margin-right: auto;
-  width: 75%;
+  max-width: 75%;
 }
 
 .img-license-picto {