How to make the captcha smaller?

[Travel Vietnam]

The recaptcha form looks too big for my form. How to make it smaller?

Please help me! Thank you in advance. My site is wp site. 

http://www.exotictravelvietnam.com/agricultural-culture-life/

[Clon Takos]

I've found this https://developers.google.com/recaptcha/docs/customization

Scroll down until customization and read what it says, it seems the image is place inside   <div id="recaptcha_image"></div> so maybe you can try adding styles to that element and see if it works