diff --git a/src/App.css b/src/App.css
deleted file mode 100644
index 00e5f71..0000000
--- a/src/App.css
+++ /dev/null
@@ -1,30 +0,0 @@
-.box {
-    background-color: #fff;
-    border-radius: 5px;
-    margin: 1em 0;
-    padding: .5em;
-    box-shadow: 0 5px 20px #999;
-}
-
-.left-container .centered-line {
-    width: calc(100% - 2 * 50px);
-}
-.flow-item {
-    flex: 0 0 600px;
-}
-.flow-reply {
-    flex: 0 0 300px;
-    max-height: 15em;
-    overflow-y: hidden;
-}
-
-.left-container .centered-line,
-.left-container .flow-item {
-    margin-left: 50px;
-}
-
-.flow-item-row {
-    display: flex;
-    overflow-x: hidden;
-    align-items: flex-start;
-}
\ No newline at end of file
diff --git a/src/App.js b/src/App.js
index 184d65e..44386d2 100644
--- a/src/App.js
+++ b/src/App.js
@@ -1,20 +1,36 @@
 import React, {Component} from 'react';
-import './App.css';
 import {Flow} from './Flows';
 import {Title} from './Title';
+import {Sidebar} from './Sidebar';
 
 class App extends Component {
-    show_details(info) {
+    constructor(props) {
+        super(props);
+        this.state={
+            sidebar_title: null,
+            sidebar_content: null,
+        };
+    }
 
+    show_sidebar(title,content) {
+        this.setState({
+            sidebar_title: title,
+            sidebar_content: content,
+        });
     }
 
     render() {
         return (
             <div>
-                <Title />
+                <Title callback={this.show_sidebar.bind(this)} />
                 <div className="left-container">
-                    <Flow callback={(info)=>this.show_details(info)} mode="list" />
+                    <Flow callback={this.show_sidebar.bind(this)} mode="list" />
                 </div>
+                <Sidebar do_close={()=>{
+                    this.setState({
+                        sidebar_content: null,
+                    });
+                }} content={this.state.sidebar_content} title={this.state.sidebar_title} />
             </div>
         );
     }
diff --git a/src/Flows.css b/src/Flows.css
index 5d09871..d63f455 100644
--- a/src/Flows.css
+++ b/src/Flows.css
@@ -1,3 +1,42 @@
+.box {
+    background-color: #fff;
+    border-radius: 5px;
+    margin: 1em 0;
+    padding: .5em;
+    box-shadow: 0 5px 20px #999;
+}
+
+.left-container .centered-line {
+    width: calc(100% - 2 * 50px);
+}
+.flow-item {
+    flex: 0 0 600px;
+}
+:not(.sidebar-flow-item) .flow-reply {
+    flex: 0 0 300px;
+    max-height: 15em;
+    margin-left: -5px;
+    overflow-y: hidden;
+}
+
+.left-container .centered-line,
+.left-container .flow-item {
+    margin-left: 50px;
+}
+
+.flow-item-row {
+    transition: margin-left 200ms ease-out;
+}
+:not(.sidebar-flow-item).flow-item-row:hover {
+    margin-left: -10px;
+}
+
+:not(.sidebar-flow-item).flow-item-row {
+    display: flex;
+    overflow-x: hidden;
+    align-items: flex-start;
+}
+
 .flow-item-row img {
     max-width: 100%;
 }
@@ -9,10 +48,7 @@
 
 .box-header-badge {
     float: right;
-    border: 1px solid black;
-    border-radius: 7px;
     margin: 0 .5em;
-    padding: 0 .5em;
 }
 
 .box-id {
diff --git a/src/Flows.js b/src/Flows.js
index 8f24c03..d9f38de 100644
--- a/src/Flows.js
+++ b/src/Flows.js
@@ -25,7 +25,23 @@ function ReplyPlaceholder(props) {
     );
 }
 
-class FlowChunkItem extends Component {
+function FlowItem(props) {
+    return (
+        <div className="flow-item box">
+            <div className="box-header">
+                {parseInt(props.info.likenum, 10) && <span className="box-header-badge">{props.info.likenum}★</span>}
+                {parseInt(props.info.reply, 10) && <span className="box-header-badge">{props.info.reply} 回复</span>}
+                <span className="box-id">#{props.info.pid}</span>&nbsp;
+                <Time stamp={props.info.timestamp} />
+            </div>
+            <pre>{props.info.text}</pre>
+            {props.info.type==='image' ? <img src={IMAGE_BASE+props.info.url} /> : null}
+            {props.info.type==='audio' ? <audio src={AUDIO_BASE+props.info.url} /> : null}
+        </div>
+    );
+}
+
+class FlowItemRow extends Component {
     constructor(props) {
         super(props);
         this.state={
@@ -33,20 +49,21 @@ class FlowChunkItem extends Component {
             reply_loading: false,
         };
         this.info=props.info;
-        if(props.info.reply) {
+        if(parseInt(props.info.reply,10)) {
             this.state.reply_loading=true;
             this.load_replies();
         }
     }
 
     load_replies() {
+        console.log('fetching reply',this.info.pid);
         fetch('http://www.pkuhelper.com:10301/pkuhelper/../services/pkuhole/api.php?action=getcomment&pid='+this.info.pid)
             .then((res)=>res.json())
             .then((json)=>{
                 if(json.code!==0)
                     throw new Error(json.code);
                 this.setState({
-                    replies: json.data,
+                    replies: json.data.slice(0,10),
                     reply_loading: false,
                 });
             });
@@ -55,18 +72,14 @@ class FlowChunkItem extends Component {
     render() {
         // props.do_show_details
         return (
-            <div className="flow-item-row">
-                <div className="flow-item box">
-                    <div className="box-header">
-                        <span className="box-header-badge">{this.info.likenum} 赞</span>
-                        <span className="box-header-badge">{this.info.reply} 回复</span>
-                        <span className="box-id">#{this.info.pid}</span>&nbsp;
-                        <Time stamp={this.info.timestamp} />
-                    </div>
-                    <pre>{this.info.text}</pre>
-                    {this.info.type==='image' ? <img src={IMAGE_BASE+this.info.url} /> : null}
-                    {this.info.type==='audio' ? <audio src={AUDIO_BASE+this.info.url} /> : null}
+            <div className="flow-item-row" onClick={()=>{this.props.callback(
+                '帖子详情',
+                <div className="flow-item-row sidebar-flow-item">
+                    <FlowItem info={this.info} />
+                    {this.state.replies.map((reply)=><Reply info={reply} key={reply.cid} />)}
                 </div>
+            )}}>
+                <FlowItem info={this.info} />
                 {this.state.reply_loading && <ReplyPlaceholder count={this.info.reply} />}
                 {this.state.replies.map((reply)=><Reply info={reply} key={reply.cid} />)}
             </div>
@@ -78,7 +91,7 @@ function FlowChunk(props) {
     return (
         <div className="flow-chunk">
             <CenteredLine text={props.title} />
-            {props.list.map((info)=><FlowChunkItem key={info.pid} info={info} callback={props.callback} />)}
+            {props.list.map((info)=><FlowItemRow key={info.pid} info={info} callback={props.callback} />)}
         </div>
     );
 }
@@ -89,9 +102,10 @@ export class Flow extends Component {
         this.state={
             mode: props.mode,
             loaded_pages: 0,
-            chunks: []
+            chunks: [],
+            loading: false,
         };
-        this.load_page(1);
+        setTimeout(this.load_page.bind(this,1), 0);
     }
 
     load_page(page) {
@@ -100,7 +114,8 @@ export class Flow extends Component {
         if(page===this.state.loaded_pages+1) {
             console.log('fetching page',page);
             this.setState((prev,props)=>({
-                loaded_pages: prev.loaded_pages+1
+                loaded_pages: prev.loaded_pages+1,
+                loading: true,
             }));
             fetch('http://www.pkuhelper.com:10301/pkuhelper/../services/pkuhole/api.php?action=getlist&p='+page)
                 .then((res)=>res.json())
@@ -111,7 +126,8 @@ export class Flow extends Component {
                         chunks: prev.chunks.concat([{
                             title: 'Page '+page,
                             data: json.data,
-                        }])
+                        }]),
+                        loading: false,
                     }));
                 })
                 .catch((err)=>{
@@ -121,12 +137,31 @@ export class Flow extends Component {
         }
     }
 
+    on_scroll(event) {
+        if(event.target===document) {
+            //console.log(event);
+            const avail=document.body.scrollHeight-window.scrollY-window.innerHeight;
+            if(avail<window.innerHeight && this.state.loading===false)
+                this.load_page(this.state.loaded_pages+1);
+        }
+    }
+
+    componentDidMount() {
+        window.addEventListener('scroll',this.on_scroll.bind(this));
+        window.addEventListener('resize',this.on_scroll.bind(this));
+    }
+    componentWillUnmount() {
+        window.removeEventListener('scroll',this.on_scroll.bind(this));
+        window.removeEventListener('resize',this.on_scroll.bind(this));
+    }
+
     render() {
         return (
             <div className="flow-container">
                 {this.state.chunks.map((chunk)=>(
                     <FlowChunk title={chunk.title} list={chunk.data} key={chunk.title} callback={this.props.callback} />
                 ))}
+                <CenteredLine text={this.state.loading ? 'Loading More...' : '© xmcp'} />
             </div>
         );
     }
diff --git a/src/Sidebar.css b/src/Sidebar.css
new file mode 100644
index 0000000..f5bfb4d
--- /dev/null
+++ b/src/Sidebar.css
@@ -0,0 +1,40 @@
+.sidebar-shadow {
+    opacity: 0;
+    background-color: black;
+    pointer-events: none;
+    transition: opacity 200ms ease-out;
+    position: fixed;
+    left: 0;
+    top: 0;
+    height: 100%;
+    width: 100%;
+    z-index: 2;
+}
+.sidebar-on .sidebar-shadow {
+    opacity: .3;
+    pointer-events: initial;
+}
+
+.sidebar {
+    transition: left 200ms ease-out;
+    position: fixed;
+    left: 100%;
+    top: 0;
+    height: 100%;
+    width: calc(100% - 700px);
+    padding: 1em;
+    background-color: #fff;
+    z-index: 3;
+    overflow-y: auto;
+}
+.sidebar-on .sidebar {
+    left: 700px;
+}
+
+.sidebar-flow-item {
+    display: block;
+}
+.sidebar-flow-item .box {
+    margin: 1em;
+    width: calc(100% - 2em);
+}
\ No newline at end of file
diff --git a/src/Sidebar.js b/src/Sidebar.js
new file mode 100644
index 0000000..3a5e0bf
--- /dev/null
+++ b/src/Sidebar.js
@@ -0,0 +1,18 @@
+import React, {Component} from 'react';
+import './Sidebar.css';
+
+export function Sidebar(props) {
+    return (
+        <div className={props.content ? 'sidebar-on' : ''}>
+            <div className="sidebar-shadow" onClick={props.do_close} />
+            <div className="sidebar">
+                <p>
+                    <a onClick={props.do_close}>×</a>
+                    &nbsp;{props.title}
+                </p>
+                <hr />
+                {props.content}
+            </div>
+        </div>
+    );
+}
\ No newline at end of file
diff --git a/src/Title.js b/src/Title.js
index 3653168..e6c11c2 100644
--- a/src/Title.js
+++ b/src/Title.js
@@ -1,22 +1,31 @@
 import React, {Component} from 'react';
 import './Title.css';
 
-const tos=`P大树洞网页版
-
-使用本网站时，您需要了解并同意：
-
-- 所有数据来自 PKU Helper，本站不对其内容负责
-- 不接受关于修改 UI 的建议
-- 英梨梨是我的，你们都不要抢`;
-
 export function Title(props) {
     return (
         <div className="title">
             <div className="title-links">
-                <a onClick={()=>{alert(tos);}}>ToS</a>
-                <a href="https://github.com/xmcp/ashole">GitHub</a>
+                <a onClick={()=>{props.callback(
+                    '关于 P大树洞（非官方） 网页版',
+                    <div>
+                        <p>使用提示：</p>
+                        <ul>
+                            <li>为保证使用体验，请使用分辨率恰好为 1920*1080 像素的电脑，并用 Chrome 浏览器 stable 分支最新版</li>
+                            <li>在列表中点击帖子可以显示全部回复</li>
+                            <li>搜索帖子功能正在开发中</li>
+                        </ul>
+                        <br />
+                        <p>使用本网站时，您需要了解并同意：</p>
+                        <ul>
+                            <li>所有数据来自 PKU Helper，本站不对其内容负责</li>
+                            <li>不接受关于修改 UI 的建议</li>
+                            <li>英梨梨是我的，你们都不要抢</li>
+                        </ul>
+                    </div>
+                )}}>Help</a>
+                <a href="https://github.com/xmcp/ashole" target="_blank">GitHub</a>
             </div>
-            P大树洞
+            P大树洞（非官方）
         </div>
     )
 }
\ No newline at end of file
diff --git a/src/index.css b/src/index.css
index 413b3a7..be5a041 100644
--- a/src/index.css
+++ b/src/index.css
@@ -5,6 +5,10 @@ body {
     background-color: #eee;
 }
 
+body::-webkit-scrollbar {
+    display: none;
+}
+
 * {
     box-sizing: border-box;
 }