Need help adding a css texture in my website to a button in my website

What is the classification i need to use for my button When i add stuff to my header navigation i use .header-nav-list, What would the starting code I use to add this css texture below to the button that says "shop now" website link below as well.

I am trying to add a css texture such as

'''

background: linear-gradient(27deg, #151515 5px, transparent 5px) 0 5px, linear-gradient(207deg, #151515 5px, transparent 5px) 10px 0px, linear gradient(27deg, #222 5px, transparent 5px) 0px 10px, linear-gradient(207deg, #222 5px, transparent 5px) 10px 5px, linear-gradient(90deg, #1b1b1b 10px, transparent 10px), linear-gradient(#1d1d1d 25%, #1a1a1a 25%, #1a1a1a 50%, transparent 50%, transparent 75%, #242424 75%, #242424); background-color: #131313; background-size: 20px 20px;

'''

I do not want to use div classification: sqs-block-button-container--center preSlide slideIn ,as the image would show up larger than the box

My website link