improvement: Move inline styles to SCSS instead (#5578)

* fix: convert propStyle to propClass

src/core/plugins/view/root-injects.jsx

@@ -76,10 +76,9 @@ const createClass = component => class extends Component {
   }
 }
 
-const Fallback = ({ name }) => <div style={{ // eslint-disable-line react/prop-types
-    padding: "1em",
-    "color": "#aaa"
-  }}>😱 <i>Could not render { name === "t" ? "this component" : name }, see the console.</i></div>
+const Fallback = ({ 
+  name // eslint-disable-line react/prop-types
+}) => <div className="fallback">😱 <i>Could not render { name === "t" ? "this component" : name }, see the console.</i></div>
 
 const wrapRender = (component) => {
   const isStateless = component => !(component.prototype && component.prototype.isReactComponent)