diff --git a/public/react/src/common/TextUtil.js b/public/react/src/common/TextUtil.js
index 82a848cac..8aef0adbd 100644
--- a/public/react/src/common/TextUtil.js
+++ b/public/react/src/common/TextUtil.js
@@ -10,7 +10,8 @@ export function markdownToHTML(oldContent, selector) {
         window.$(selector).html(oldContent)
     } else {
         try {    
-        var markdwonParser = window.editormd.markdownToHTML("md_div", {
+            // selector || 
+        var markdwonParser = window.editormd.markdownToHTML(selector || "md_div", {
             markdown: oldContent, // .replace(/▁/g,"▁▁▁"),
             emoji: true,
             htmlDecode: "style,script,iframe",  // you can filter tags decode
@@ -23,6 +24,10 @@ export function markdownToHTML(oldContent, selector) {
         } catch(e) {
             console.error(e)
         }
+        // selector = '.' + selector
+        if (selector) {
+            return;
+        }
         
         const content = window.$('#md_div').html()
         if (selector) {
diff --git a/public/react/src/common/components/markdown/MarkdownToHtml.css b/public/react/src/common/components/markdown/MarkdownToHtml.css
new file mode 100644
index 000000000..affba12cd
--- /dev/null
+++ b/public/react/src/common/components/markdown/MarkdownToHtml.css
@@ -0,0 +1,6 @@
+.markdownToHtml.editormd-html-preview, .markdownToHtml.editormd-preview-container {
+    overflow: hidden;
+}
+.markdownToHtml.editormd-html-preview p.editormd-tex, .markdownToHtml.editormd-preview-container p.editormd-tex {
+    text-align: left;
+}
\ No newline at end of file
diff --git a/public/react/src/common/components/markdown/MarkdownToHtml.js b/public/react/src/common/components/markdown/MarkdownToHtml.js
index 0780fc789..c7d15cf64 100644
--- a/public/react/src/common/components/markdown/MarkdownToHtml.js
+++ b/public/react/src/common/components/markdown/MarkdownToHtml.js
@@ -1,5 +1,6 @@
 import React,{ Component } from "react";
 import { markdownToHTML } from 'educoder'
+import './MarkdownToHtml.css'
 /** 
   selector 需要传入唯一的selector作为id，不然会引起冲突
   delay 如果有公式，需要传入delay={true}
@@ -14,9 +15,9 @@ class MarkdownToHtml extends Component{
     if (this.props.delay == true) {
       (function(content, selector) {
         // console.log('selector: ', selector)
-          setTimeout(() => {
+          // setTimeout(() => {
               markdownToHTML(content, selector)
-          }, 600)
+          // }, 600)
       })(content, selector)
     } else {
       markdownToHTML(content, selector)
@@ -25,18 +26,20 @@ class MarkdownToHtml extends Component{
   componentDidUpdate = (prevProps) => {
     if (this.props.content) {
       if ( prevProps.content != this.props.content ) {
-        this._markdownToHTML(this.props.content, `.markdown_to_html_${this.props.selector || ''}`)
+        this._markdownToHTML(this.props.content, `markdown_to_html_${this.props.selector || ''}`)
       }
     }
   }
   componentDidMount () {
-    this.props.content && this._markdownToHTML(this.props.content, `.markdown_to_html_${this.props.selector || ''}`)
+    this.props.content && this._markdownToHTML(this.props.content, `markdown_to_html_${this.props.selector || ''}`)
     
   }
   render(){
     const { style, className } = this.props
+    let _selector = `markdown_to_html_${this.props.selector || ''}`
+    
     return(
-      <div id="memo_content_editorMd" className={`new_li markdown-body ${className} markdown_to_html_${this.props.selector || ''}`}
+      <div id={_selector } className={`markdownToHtml new_li markdown-body ${className} ${_selector}`}
         // dangerouslySetInnerHTML={{__html: markdownToHTML(this.props.content)}}
         style={style}
       >