These two rules in styles.css are the problems

.featured-posts {
  background-color: #2f2f37;
  border-radius: 0.25rem;
}
...
html .text-person {
  color: #dedede !important;
  font-weight: 700;
  font-size: 12px;
}

.featured-posts needs a light or unset background-color

.text-person needs a darker color

I tested on .ml and both look fine so I guess this is a result of the custom theme

If someone can point me at the repo I’ll submit a PR if you want