asset/scss/global/_branding.scss

@@ -2,10 +2,10 @@
   .site-name,.site-description {
      display: none;
   }
-  &::before {
+  &:before {
     content: '';
     display:inline-block;
-    margin-top:-$global-padding;
+    // margin-top:-$global-padding;
     width: 100%;
     height: $global-padding*5;
     background-size: contain;
@@ -35,3 +35,11 @@
     }
   }
 }
+
+.arc-hive-off.site-brand{
+  //hack needed for omeka
+  margin-bottom: -$global-padding*0.5;
+  &:before{
+    margin-top: -$global-padding;
+  }
+}

asset/scss/modules/_header.scss

@@ -9,7 +9,7 @@
         text-align: center;
       }
       @include breakpoint (medium) {
-        padding: $global-padding*2 $global-padding;
+        padding: $global-padding $global-padding;
       }
       @include breakpoint(large){
         @include xy-cell(shrink);