make ra editor css compatible with non firefox browsers

css/rulesAssistant/conditionEditor.css

@@ -27,7 +27,7 @@
 }
 
 .rule-part {
-    display: inline flow-root;
+    display: inline-block;
     border-radius: 8px;
     border: 2px solid #333333;
     background-color: #1a1a1a;
@@ -47,7 +47,7 @@
 }
 
 .rule-drag-element {
-    display: inline flow-root;
+    display: inline-block;
     background-image: repeating-linear-gradient(0, #1a1a1a, transparent 0.2em, transparent 0.2em, #1a1a1a 0.4em),
     repeating-linear-gradient(90deg, #1a1a1a, #777 0.2em, #777 0.2em, #1a1a1a 0.4em);
     width: 1.6em;
@@ -58,7 +58,7 @@
 .rule-drop-location {
     border: #999 dashed 1px;
     border-radius: 4px;
-    display: inline flow-root;
+    display: inline-block;
     background-color: #555;
     width: 5em;
     height: 1.5em;