diff --git a/src/code/index.wc b/src/code/index.wc
index 0977a75..765ff03 100644
--- a/src/code/index.wc
+++ b/src/code/index.wc
@@ -1,12 +1,12 @@
 <template>
   <div class="code-box">
     <header class="title">
-      <span><i></i><i></i><i></i></span>
-      <span></span>
-      <span>
+      <section><i></i><i></i><i></i></section>
+      <section></section>
+      <section>
         <wc-icon title="运行" class="act run" is="live"></wc-icon>
         <wc-icon title="复制" class="act cp" is="doc"></wc-icon>
-      </span>
+      </section>
     </header>
     <wc-scroll axis="y" class="scoll"></wc-scroll>
   </div>
@@ -25,7 +25,6 @@
   width: 100%;
   max-height: 610px;
   margin: 10px 0;
-  padding-bottom: 8px;
   border-radius: 3px;
   background: #f7f8fb;
   color: var(--color-dark-1);
@@ -42,19 +41,25 @@
     font-size: 14px;
     user-select: none;
 
+    section {
+      display: flex;
+      align-items: center;
+    }
+
     i {
-      display: inline-block;
+      display: block;
       width: 12px;
       height: 12px;
       margin-right: 6px;
       border-radius: 50%;
       background: var(--color-red-1);
-    }
-    i:nth-child(2) {
-      background: var(--color-orange-1);
-    }
-    i:nth-child(3) {
-      background: var(--color-green-1);
+
+      &:nth-child(2) {
+        background: var(--color-orange-1);
+      }
+      &:nth-child(3) {
+        background: var(--color-green-1);
+      }
     }
 
     .act {
@@ -74,9 +79,8 @@
 
   .scoll {
     flex: 1;
-    padding: 5px 0;
+    padding: 5px 0 0;
     line-height: 20px;
-    font-family: Menlo, Monaco, Consolas, 'Courier New', monospace;
     font-size: 14px;
     color: var(--color-dark-1);
     cursor: text;
@@ -87,6 +91,7 @@
       position: relative;
       min-height: 20px;
       padding: 0 8px 0 45px;
+      font-family: Menlo, Monaco, Consolas, 'Courier New', monospace;
       white-space: pre-wrap;
       word-break: break-word;
 
@@ -131,7 +136,15 @@
 :host([exec]) {
   .title {
     .run {
-      display: inline-block;
+      display: block;
+    }
+  }
+}
+
+:host([hide-copy]) {
+  .title {
+    .cp {
+      display: none;
     }
   }
 }
diff --git a/src/scroll/index.wc b/src/scroll/index.wc
index 0e45c2d..a5e4b1e 100644
--- a/src/scroll/index.wc
+++ b/src/scroll/index.wc
@@ -194,7 +194,7 @@ export default class Scroll {
     } else if (moveX > width - xBar) {
       moveX = width - xBar
     }
-    this.__BOX__.scrollLeft = moveX
+    this.__BOX__.scrollLeft = (scrollX - width) * (moveX / (width - xBar))
     this.__X__.style.transform = `translateX(${moveX}px)`
 
     return moveX
@@ -209,19 +209,17 @@ export default class Scroll {
       moveY = height - yBar
     }
 
-    this.__BOX__.scrollTop = moveY
+    this.__BOX__.scrollTop = (scrollY - height) * (moveY / (height - yBar))
     this.__Y__.style.transform = `translateY(${moveY}px)`
     return moveY
   }
 
   _fireReachEnd(action = 'reach-bottom') {
-    var { scrollY, height, delay, disabled } = this.props
+    var { delay } = this.props
+    var { scrollY, height } = this.state
     var top = this.__BOX__.scrollTop
     var now = Date.now()
 
-    if (disabled) {
-      return
-    }
     if (now - this.__last__ > delay) {
       if (action === 'reach-bottom') {
         if (height + top < scrollY) {
@@ -349,11 +347,11 @@ export default class Scroll {
       moveY,
       mousemoveFn = ev => {
         let { thumbY, thumbX } = this.state
-        if (startX !== null) {
+        if (startX !== undefined) {
           moveX = this._fetchScrollX(thumbX + ev.pageX - startX)
         }
 
-        if (startY !== null) {
+        if (startY !== undefined) {
           moveY = this._fetchScrollY(thumbY + ev.pageY - startY)
         }
       },
@@ -361,8 +359,8 @@ export default class Scroll {
         if (Math.abs(ev.pageY - startY) > this.props.distance) {
           this._fireReachEnd(ev.pageY > startY ? 'reach-bottom' : 'reach-top')
         }
-        startX = null
-        startY = null
+        startX = undefined
+        startY = undefined
         this.state.thumbX = moveX || 0
         this.state.thumbY = moveY || 0
         delete this._active
@@ -370,7 +368,7 @@ export default class Scroll {
         $.unbind(document, 'mouseup', mouseupFn)
       }
 
-    $.bind(this.__Y__, 'mousedown', ev => {
+    this._yBarFn = $.bind(this.__Y__, 'mousedown', ev => {
       startY = ev.pageY
 
       this._active = true
@@ -379,7 +377,7 @@ export default class Scroll {
       $.bind(document, 'mouseup', mouseupFn)
     })
 
-    $.bind(this.__X__, 'mousedown', ev => {
+    this._xBarFn = $.bind(this.__X__, 'mousedown', ev => {
       startX = ev.pageX
       this._active = true
 
@@ -387,18 +385,20 @@ export default class Scroll {
       $.bind(document, 'mouseup', mouseupFn)
     })
 
-    // this.__observer = new MutationObserver(this._initFn)
-    // this.__observer.observe(this, {
-    //   childList: true,
-    //   subtree: true,
-    //   attributeFilter: ['style']
-    // })
+    this.__observer = new MutationObserver(this._initFn)
+    this.__observer.observe(this, {
+      childList: true,
+      subtree: true,
+      attributeFilter: ['style']
+    })
   }
 
   unmount() {
-    // this.__observer.disconnect()
+    this.__observer.disconnect()
 
-    $.unbind(this, 'mouseenter', this._initFn)
+    $.unbind(this.__X__, 'mousedown', this._xBarFn)
+    $.unbind(this.__Y__, 'mousedown', this._yBarFn)
+    $.unbind(this, 'ready', this._initFn)
     $.unbind(this.__BOX__, 'scroll', this._scrollFn)
   }
 
diff --git a/src/utils.js b/src/utils.js
index 50b3267..790d146 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -92,7 +92,7 @@ export default {
    */
   catch(dom, type, fn, phase) {
     function fn2(ev) {
-      ev.stopPropagation()
+      ev.stopPropagation && ev.stopPropagation()
       fn && fn(ev)
     }
     return this.bind(dom, type, fn2, phase)