(css) Improve display of recurrence editor

UI/WebServerResources/scss/components/checkbox/checkbox.scss

@@ -7,6 +7,11 @@ md-sidenav md-checkbox {
     margin: 0;
 }
 
+// Checkbox in an inline form beside a select element
+.md-inline-form md-checkbox.sg-checkbox--with-select {
+  margin: 2.5*$baseline-grid $baseline-grid/2 3*$baseline-grid + 2 0;
+}
+
 // Checkbox for the sg-checkmark directive
 // ---------------------------------------
 .sg-checkmark {
@@ -16,4 +21,4 @@ md-sidenav md-checkbox {
   &.sg-checked md-icon {
     opacity: 1;
   }
-}
+}