Maybe try the following CSS (as in previous thread) but this won’t be easy:
/* Change background to black and text to white */
#shopify-section-template--23934807802195__multicolumn_DVY4P7 .multicolumn-card {
background-color: black !important;
}
#shopify-section-template--23934807802195__multicolumn_DVY4P7 .multicolumn-card__info a {
color: white !important;
}
/* Make the whole button area clickable */
#shopify-section-template--23934807802195__multicolumn_DVY4P7 .multicolumn-card__info a {
display: block;
width: 100%;
height: 100%;
padding: 20px;
text-align: center;
}