Header Customization

I need help as I am newbie and making website using divi theme and builder but i am not able to get the desired results. I am Uploading few Images, one is from the reference website and the other is my header image. I Have couple of issues space on both sides of header, We can see sufficient space in the reference website’s header but I am not able to do so (https://pasteboard.co/HOZUI1y.jpg – Reference website Screen shot) (https://pasteboard.co/HOZVlhw.jpg – my website where is very less space on both sides) 2.My website’s Header Looks average untill we scroll down and then it becomes worst (https://pasteboard.co/HOZWgVY.jpg ) and my reference website looks awesome when we scroll it down (https://pasteboard.co/HOZWLCn.jpg) Please Help me to match up with this reference website, i want my website’s header same as their.

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