Button Blocks - Primary

#siteWrapper .sqs-block-button a.sqs-button-element--primary

Button Blocks - Secondary

#siteWrapper .sqs-block-button a.sqs-button-element--secondary

Button Blocks - Tertiary

#siteWrapper .sqs-block-button a.sqs-button-element--tertiary

Header CTA - Desktop, Mobile

#header .header-actions-action--cta a.btn, #header .header-menu-cta a.btn

Specific Button Block

#siteWrapper #block-id a