Recaptcha image size

Absolutely love this plugin, by far the best contact form I have used, but there is one major stumbling block – the captcha image is not responsive. The div #recaptcha_area and the table #recaptcha_table are both hard coded to 318px wide. As the styling is both inline and !important, I cannot override it in the CSS. I’ve got an ugly workaround in place on one of my sites aat the moment to push the left margin off the screen, but even with overflow: hidden, it still gives me a horizontal scrollbar on smaller mobile devices (the iPhone5 is only 303px wide) Any suggestions?

https://ww.wp.xz.cn/plugins/contact-forms/