diff --git a/packages/designer/src/builtin-simulator/host.less b/packages/designer/src/builtin-simulator/host.less
index 3b110e3db..669a40f6d 100644
--- a/packages/designer/src/builtin-simulator/host.less
+++ b/packages/designer/src/builtin-simulator/host.less
@@ -24,7 +24,11 @@
 
   &-device-mobile {
     left: 50%;
-    width: 378px;
+    width: 375px;
+    top: 16px;
+    bottom: 16px;
+    max-height: calc(100% - 32px);
+    max-width: calc(100% - 32px);
     transform: translateX(-50%);
     box-shadow: 0 2px 10px 0 rgba(31,56,88,.15);
   }
@@ -33,11 +37,11 @@
     left: 50%;
     top: 50%;
     transform: translate(-50%, -50%);
-    width: 378px;
+    width: 375px;
     height: 812px;
     max-height: calc(100vh - 50px);
     background: url(https://img.alicdn.com/tfs/TB1b4DHilFR4u4jSZFPXXanzFXa-750-1574.png) no-repeat top;
-    background-size: 378px 812px;
+    background-size: 375px 812px;
     border-radius: 44px;
     box-shadow: rgba(0, 0, 0, 0.1) 0 36px 42px;
     .@{scope}-canvas-viewport {
@@ -52,10 +56,10 @@
 
   &-device-iphone6 {
     left: 50%;
-    width: 378px;
+    width: 375px;
     transform: translateX(-50%);
     background: url(https://img.alicdn.com/tps/TB12GetLpXXXXXhXFXXXXXXXXXX-756-1544.png) no-repeat top;
-    background-size: 378px 772px;
+    background-size: 375px 772px;
     top: 8px;
     .@{scope}-canvas-viewport {
       width: auto;
diff --git a/packages/rax-simulator-renderer/src/renderer.less b/packages/rax-simulator-renderer/src/renderer.less
index abc72bd4d..b71dde989 100644
--- a/packages/rax-simulator-renderer/src/renderer.less
+++ b/packages/rax-simulator-renderer/src/renderer.less
@@ -18,13 +18,7 @@ html.engine-cursor-ew-resize, html.engine-cursor-ew-resize * {
 }
 
 ::-webkit-scrollbar {
-  width: 5px;
-  height: 5px;
-}
-
-::-webkit-scrollbar-thumb {
-  background-color: rgba(0, 0, 0, 0.3);
-  border-radius: 5px;
+  display: none;
 }
 
 .lc-container {