Mobile and Tablet Optimisation

I am very new to Webflow, I have designed a website on ‘Laptop’ which is now completely finished and needs to be updated on ‘Mobile’ and ‘Tablet’. However, when I went to do this I noticed the work I had done on ‘Laptop’ hadn’t completely converted onto ‘Mobile’ and ‘Tablet’? It still has the old template colours which I was using etc? Please help!

Please find the preview to the website here: