Why is recaptcha image fixed in size 300x57 ? Even when customizing the div where the image is injected, the width and height of the div are overridden and set to 300x57. Of course the image can be re-sized after it's rendered, but why there are no options to generate the image the size developers would like it to be.
http://code.google.com/apis/recaptcha/docs/customization.html
reCAPTCHA will rely on the presence of HTML elements with the following IDs to display the CAPTCHA to the user: An empty div with ID recaptcha_image. This is where the actual image will be placed. The div will be 300x57 pixels
Thank you
#recaptcha_image img {
    width: 200px !important;
    height: 38px !important;
}
                        You can override inline css adding !important behind a css rule, even in an external file.
Full customization with css, demo
<form method="POST" action="">
<script type="text/javascript">
                                var RecaptchaOptions = {
                                    tabindex: 1,
                                    theme: 'custom',
                                    custom_theme_widget: 'recaptcha_widget'
                                };
                            </script>
                            <div id="recaptcha_widget" style="display:none"><div id="recaptcha_image"></div>
                                <div class="recaptcha_only_if_incorrect_sol" style="color:red">Incorrect, please try again</div>
                                <span class="recaptcha_only_if_image">Enter the words above:</span>
                                <span class="recaptcha_only_if_audio">Type what you hear:</span>
                                <input type="text" id="recaptcha_response_field" name="recaptcha_response_field">
                                <div class="get_another_captcha"><a href="javascript:Recaptcha.reload()">Get another CAPTCHA</a></div>
                                <div class="recaptcha_only_if_image"><a href="javascript:Recaptcha.switch_type('audio')">Get an audio CAPTCHA</a></div>
                                <div class="recaptcha_only_if_audio"><a href="javascript:Recaptcha.switch_type('image')">Get an image CAPTCHA</a></div>
                                <div><a href="javascript:Recaptcha.showhelp()">Help</a></div>
                                <script type="text/javascript" src="http://www.google.com/recaptcha/api/challenge?k=YourAPI"></script>
                                <noscript><iframe src="http://www.google.com/recaptcha/api/noscript?k=YourAPI" height="300" width="500" frameborder="0"></iframe><br>
                                <textarea name="recaptcha_challenge_field" rows="3" cols="40">
                                </textarea>
                                <input type="hidden" name="recaptcha_response_field" value="manual_challenge"></noscript></div>
                            <script type="text/javascript">
                                window.onload = function() {
                                    Recaptcha.focus_response_field();
                                }
                            </script>
                            <table cellspacing="0" cellpadding="4" border="0" style="font-family: Helvetica, sans-serif; color: #000000; font-size: 12px;"><tr><td><div><input type="submit" name="Button1" value="Submit"></div></td></tr></table></form>
                        Solution working for the new google Recaptcha (https://www.google.com/recaptcha/)
<!--adjust to your needs -->
<div class="g-recaptcha" data-sitekey="your_sitekey" style="transform:scale(.8); margin:0 -30px">
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