Make the MarkdownToolbar prettier

lib/editors/markdown_editor.dart

@@ -135,7 +135,6 @@ class MarkdownEditorState extends State<MarkdownEditor>
     var settings = Provider.of<Settings>(context);
     if (settings.experimentalMarkdownToolbar && editingMode) {
       body = Container(
-        height: 600,
         child: Column(
           children: <Widget>[
             Expanded(child: editor),

lib/widgets/markdown_toolbar.dart

@@ -9,29 +9,36 @@ class MarkdownToolBar extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return Row(
+    return Container(
+      child: Row(
         children: [
           IconButton(
             icon: const Text('H1'),
+            padding: const EdgeInsets.all(0.0),
             onPressed: () => _modifyCurrentLine('# '),
           ),
           IconButton(
             icon: const Text('I'),
+            padding: const EdgeInsets.all(0.0),
             onPressed: () => _modifyCurrentWord('*'),
           ),
           IconButton(
             icon: const Text('B'),
+            padding: const EdgeInsets.all(0.0),
             onPressed: () => _modifyCurrentWord('**'),
           ),
           IconButton(
             icon: const Icon(Icons.navigate_before),
+            padding: const EdgeInsets.all(0.0),
             onPressed: _navigateToPrevWord,
           ),
           IconButton(
             icon: const Icon(Icons.navigate_next),
+            padding: const EdgeInsets.all(0.0),
             onPressed: _navigateToNextWord,
           ),
         ],
+      ),
     );
   }