STICKY HEADER FOR NARRATIVE (PLEASE HELP)

[obiscloset]

I am struggling with adjusting my theme code to add a sticky header on my narrative theme! I am trying to get higher conversion rates and this navigation menu is NOT  cutting it! I've searched throughout the community from solutions a year ago, but the coding is nowhere near the same !! Here is a link to my store with the coding attached. Please help. 

https://obiscloset.com/ 

[Zworthkey]

Hii, @obiscloset 
Paste this code on top of the theme.scss file.

.site-header.site-header--homepage.site-header--transparent {
    position: fixed !important;
    top: 0px !important;
    background-color: black !important;
}

Thank You.