Site Identity and Social Media

Not sure what to call this issue. When I try to post my website address in a LinkedIn post or in a Facebook post, the image that is displayed is NOT my logo and site header. When I post to LinkedIn, it shows my content page that is at the bottom of the page, not my site logo and header. When I post to FB, it shows a graphic from my featured content. Is there a CSS setting that will always direct www.michaeldmullen.com to show the logo and site identity title? Do I need an anchor tag? To see what this looks like in both LI and FB, check this page. https://www.michaeldmullen.com/temporary-graphic-page/ Thanks. MM