Center my content

I have googled and tryid some css codes like.

margin-left: auto;
margin-right: auto;
margin-left: 50%;
margin-right: -50%;
etc.

When i visit the site on my phone then its ok everything is centered but not the logo.
How do i center the logo.
Im using <center>img</center>
On PC its centered but not on mobile phone.

Anyways how do i center the content on pc version and how do i center the logo on mobile phone.

• This topic was modified 6 years, 11 months ago by autox420.
• This topic was modified 6 years, 11 months ago by autox420.
• This topic was modified 6 years, 11 months ago by Jan Dembowski.

The page I need help with: [log in to see the link]