some css problem ? not sure

On this page
http://www.lucysummersliving.com/contact-2/

we are using this shortcode

<p>[mc4wp_checkbox “Sign me up for the newsletter”]</p>

However seems to be interfering with the page layout – if you hover over the top image / menu area this goes opaque – and so you cannot navigate the menu links

We are using a woocommerce template call Mystile

Thanks for your help in advance – other than this the plugin works …

https://ww.wp.xz.cn/plugins/yikes-inc-easy-mailchimp-extender/