Header aligned at the center

Good evening, my header is set by default to the left, so I have tried to 
add coding (on HTML at the theme or adding CSS at the advanced). In some 
devices it looks like it's aligned to the center, and on the mobile is also 
correct. However, on my laptop it's not quite centered for some reason. 
Does this have to do with my template design?

I have spent hours trying to find the solution :/

This is my blog: https://danielazzip.blogspot.co.uk/

Many thanks!

<https://lh3.googleusercontent.com/-Q4ssUHLCcRo/WsKmY_1WsNI/AAAAAAAARGU/RnqNfehLxUQOwA1dUdmH8T7atdDpM5VXACLcBGAs/s1600/2018-04-02.png>

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