WIP updates

css/calculation-fields.css

+.form-math-markup-element .js-math-result,
+.form-math-markup-element-calculated .js-math-preview,
+.js-math-result-base {
+  display: none;
+}
+
+.form-math-markup-element .js-math-preview,
+.form-math-markup-element-calculated .js-math-result {
+  display: block;
+}