Remove inline style & adjust iframe width

aleksis/core/assets/components/LegacyBaseTemplate.vue

@@ -2,9 +2,8 @@
   <div class="position: relative;">
     <iframe
       :src="'/django' + $route.path + queryString"
-      style="border: 0; margin: -12px"
-      width="100%"
       :height="iFrameHeight + 'px'"
+      class="iframe-fullsize"
       @load="load"
       ref="contentIFrame"
     ></iframe>
@@ -72,3 +71,11 @@ export default {
   name: "LegacyBaseTemplate",
 };
 </script>
+
+<style scoped>
+.iframe-fullsize {
+  border: 0;
+  width: calc(100% + 24px);
+  margin: -12px
+}
+</style>