Global Styling to https://theinterplex.org/staging/8403

I added CSS to all the post grid pages and only a few are showing the styling. Can you advise me on how to have all the pages with styling?

/* Apply border radius to post images */
.post-grid .post-grid-item img {
border-radius: 30px!important;
}

/* Set title color to black */
.post-grid .post-grid-item .post-grid-title {
color: #000000!important;
}

.post-meta {display: none;}
.author {display: none;}