diff --git a/src/layouts/index.less b/src/layouts/index.less
index 93a5acbb..fe1376f2 100644
--- a/src/layouts/index.less
+++ b/src/layouts/index.less
@@ -8,8 +8,8 @@ body {
 
 .code-mirror-wrapper .CodeMirror {
   position: absolute;
-  height: calc(100% - 64px);
-  width: 100%;
+  height: calc(100vh - 176px);
+  width: calc(100% - 32px);
 }
 
 .ant-pro-grid-content.wide {