fix: height 100% on flexer and step view

Author: KernelDeimos

src/gui/src/UI/Components/Flexer.js

@@ -34,6 +34,7 @@ export default def(class Flexer extends Component {
 
     static CSS = `
         :host > div {
+            height: 100%;
             display: flex;
             flex-direction: column;
             justify-content: center;

src/gui/src/UI/Components/StepView.js

@@ -30,7 +30,10 @@ export default def(class StepView extends Component {
     }
 
     static CSS = `
-        #wrapper { display: none }
+        #wrapper {
+            display: none;
+            height: 100%;
+        }
         * { -webkit-font-smoothing: antialiased;}
     `;