s2member captcha how to make responsive – css or javascript

You can set the responsive view by adding this to the bottom of your CSS file.

@media only screen and (max-device-width: 480px) {
#recaptcha_table { width:70%; }
    }

You can also overwrite rules by adding !important; after the style of the class.

You could even add this into your header after you have called the CSS file to make sure this is the last CSS rule.