Thank you, I pasted the code at the top of the file and it worked. However, it is changing the entire website grid. I tried the same code someone else provided for a specific section, and it only worked for the blog page.
div#shopify-section-template–15625122676815__main .grid.grid–uniform {
display: flex;
flex-wrap: wrap;
}
@media only screen and (min-width: 769px) {
div#shopify-section-template–15625122676815__main .medium-up–one-third {
max-width: 20%;
}
}