Fix height of not found pages

Author: Ives van Hoorne

packages/app/src/app/pages/Sandbox/index.js

@@ -64,7 +64,7 @@ class SandboxPage extends React.Component {
 
     if (store.editor.notFound) {
       return (
-        <Centered horizontal vertical>
+        <Centered style={{ height: '100vh' }} horizontal vertical>
           <Title>
             We could not find the Sandbox you{"'"}re looking for...
             <br />
@@ -77,7 +77,7 @@ class SandboxPage extends React.Component {
 
     if (store.editor.error) {
       return (
-        <Centered horizontal vertical>
+        <Centered style={{ height: '100vh' }} horizontal vertical>
           <Title>An error occured when fetching the sandbox:</Title>
           <SubTitle>{store.editor.error}</SubTitle>
           <br />

packages/app/src/app/pages/common/NotFound/elements.js

@@ -1,18 +1,14 @@
 import styled from 'styled-components';
 
 export const Container = styled.div`
-  position: absolute;
-  top: 0;
-  bottom: 0;
-  left: 0;
-  right: 0;
   margin: auto;
   display: flex;
   align-items: center;
   justify-content: center;
   flex-direction: column;
   font-size: 1.5rem;
   color: white;
+  height: 100vh;
 `;
 
 export const Title = styled.h1`