include editor placeholder and remove title (#106)

diff --git a/frontend/src/components/contents/presentations/Editor.jsx b/frontend/src/components/contents/presentations/Editor.jsx
index c3f0b86..93ddfd7 100644
--- a/frontend/src/components/contents/presentations/Editor.jsx
+++ b/frontend/src/components/contents/presentations/Editor.jsx
@@ -144,20 +144,7 @@
       <div className="editor">
         <div className="container-fluid editor-area card-header">
           <div className="input-group input-style">
-            <div style={{
-              height: '60px',
-              width: '60px',
-              color: '#ffffff',
-              textAlign: 'left',
-              lineHeight: '30px',
-            }}
-            >
-              <spna>
-                Query
-                <br />
-                Editor
-              </spna>
-            </div>
+
             <div id="codeMirrorEditor" className="form-control col-11 editor-code-wrapper">
               <CodeMirror
                 onClick={onClick}
diff --git a/frontend/src/components/editor/presentations/CodeMirror.scss b/frontend/src/components/editor/presentations/CodeMirror.scss
new file mode 100644
index 0000000..aca92b0
--- /dev/null
+++ b/frontend/src/components/editor/presentations/CodeMirror.scss
@@ -0,0 +1,4 @@
+pre.CodeMirror-placeholder.CodeMirror-line-like{
+    color:grey;
+    opacity: 90%;
+}
\ No newline at end of file
diff --git a/frontend/src/components/editor/presentations/CodeMirrorWrapper.jsx b/frontend/src/components/editor/presentations/CodeMirrorWrapper.jsx
index 38b892f..3dc2995 100644
--- a/frontend/src/components/editor/presentations/CodeMirrorWrapper.jsx
+++ b/frontend/src/components/editor/presentations/CodeMirrorWrapper.jsx
@@ -20,7 +20,9 @@
 import React, { useRef, useState } from 'react';
 import CodeMirror from '@uiw/react-codemirror';
 import 'codemirror/keymap/sublime';
+import 'codemirror/addon/display/placeholder';
 import 'codemirror/theme/ambiance-mobile.css';
+import './CodeMirror.scss';
 import PropTypes from 'prop-types';
 
 const CodeMirrorWrapper = ({
@@ -37,6 +39,7 @@
       options={{
         keyMap: 'sublime',
         mode: 'cypher',
+        placeholder: 'Create a query...',
         tabSize: 4,
         lineNumbers: true,
         spellcheck: false,