Where to find a theme like this

Hello Emilll

What is your company doing?Website development and hosting?

Kind Regards
Ruben Mostert

We are currently only building websites for our own. But we would like to offer website developement for other companies aswell.

I would recommend a site like This It looks profesional and you can use the slider to display the responsiveness of your websites

You can also use this for all your clients.

Kind Regards
Ruben Mostert

Hi Emilll,
If you are going down the route of web development for yourself and clientèle you may want to consider the (reponsive Theme) https://cyberchimps.com/responsive-theme/
which is free and very customizable. Create your own child themes and have them template ready for your customers. If you put it together with say (Layerslider) https://www.techerhut.com/download-layerslider-v4-6-5-responsive-wordpress-plugin-free/
or even just (meteor slider) https://www.ads-software.com/plugins/meteor-slides/ also free you can make very dynamic websites for your customers.