PC and Mobile Version Match with Website

Hello all first let me start off by saying thank you to every one that has been so supportive and kind in with helping me.

My next issue that I am facing that has just been brought to my attention is the fact that my website design does not match PC vs Mobile.

I was wondering if someone can give me some help with this, I have done my research and I have added the code

<meta charset="UTF-8">
  <meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0">

Code (markup):

However my main page for example the navigation bar is perfect when the mobile is vertical or horizontal, the about me page is messed up totally on mobile, and on mobile for both pages the about and testimonial pages the navigation bar does not spread across the page like the main page does.

https://piratesdmcaservice.com <-- is the site I'm working on. if anyone can help with a few of these issues I would really really appreciate it. Thank you

 

Just to clarify this is how it looks on the browser of my PC https://i.imgur.com/Qk2KnCH.png

below is how it looks on my mobile device. How do I get it to respond the same?

 

Hi there pirate_tat87,

members here will require a link to the page in question or the relevant page
HTML and CSS to enable them assess your problem and possibly resolve it.
​

coothead

 

I did provide a link in the original post.