Layout changes

src/App.js

@@ -141,16 +141,16 @@ class App extends IPCContainer {
       let key = 0;
       mainContent.push((
         <Box key={'md_' + key++}
-             dxStyle={{padding: '8px', height: 'auto'}}>
+             dxStyle={{padding: 'var(--default_spacing)', height: 'auto'}}>
           <ReleaseVersionDisplay downloadDisabled={!downloadEnabled}
                                  version={selectedVersion}/>
         </Box>
       ));
       mainContent.push(<div key={'md_' + key++}
-                            style={{paddingTop: '8px'}}/>);
+                            style={{paddingTop: 'var(--default_spacing)'}}/>);
       if (allowMount) {
         mainContent.push((
-          <Box dxStyle={{padding: '8px', height: 'auto'}}
+          <Box dxStyle={{padding: 'var(--default_spacing)', height: 'auto'}}
                key={'md_' + key++}>
             <MountItems allowConfig={allowConfig}
                         allowSiaPrime={allowSiaPrime}