Making my website responsive

Good afteoon

I have managed to build my website (Sureseal: Hard Surface Restoration Specialists) but I am having problems getting the site to work across all platforms. My website looks and works perfect on Microsoft Edge but when I use Chrome the navigation bar doesn't work, also, it works fine (just a few tweaks required) on iPhone but the navigation bar doesn't work on Android.

Can anybody help me? If you need to see the code then please ask and I will post it up here. Please be aware I am new to this s any help and advice would be much appreciated.

Thank you in advance.