Can't see verification word in comment form of Blogspot? here is tip for you

Blogger comment form has a mode which only allow comment when enter the right word verification . But sometime we can't see the verification word because size of comment form is too small .
Can't see the verification word ,can't comment . How to fix this problem for your blog ?

in this picture of comment form ,you can see the verification word but you can't see the box to type this word into ,and see no button to submit your comment .

The solution here is adding a scrolling bar for comment form .
To do that ,follow some steps bellow :
1,Login to Blogger account
Go to Layout ,continue to Edit in HTML .
Checked Expand Widgets template
2,Find this code :

<iframe allowtransparency='true' class='blogger-iframe-colorize' frameborder='0' height='275' id='comment-editor' scrolling='no' src='' width='417'/>

and change it to :

<iframe allowtransparency='true' class='blogger-iframe-colorize' frameborder='0' height='275' id='comment-editor' scrolling='auto' src='' width='417'/>

Save template . Ok,you are done .
But if you don't want to add a scroll bar to comment form ,you can make your comment form larger by changing the code above to this :

<iframe allowtransparency='true' class='blogger-iframe-colorize' frameborder='0' height='475' id='comment-editor' scrolling='no' src='' width='417'/>