Contact Form not responsive

Hello Moderators,

As Sydney did not offer a ContactForm I used CF7 and divided the page in 2 boxes/columns with SiteOrigin PageBuilder. Now it behaves well on PC but does not remain in the box/column when on mobile devices.
So the problem is responsiveness…
I know it is a bit outside the Sydney Theme itself, but could you give me some CSS code to let it behave [if this is possible…]or at least give me a hint how to go about it.
I am a beginner and what I find on internet is too advanced for me.
Hereby the page
Your help is much appreciated :slight_smile:

Kind regards

Dear Leticia,

Could you please try to apply the following CSS code through the Simple Custom CSS plugin or child theme’s style.css?

.wpcf7-form input,
.wpcf7-form textarea,
.wpcf7-recaptcha > div{
  max-width: 100% !important;