Fix height of body

_server/css/editor.css

@@ -5,6 +5,11 @@ html, body, div, img {
     padding: 0;
 }
 
+html, body {
+    height: 100%;
+    overflow: hidden;
+}
+
 body {
     font-family: Roboto, "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, sans-serif;;
 }