.youtube-grid {

  .thumbnail-container {
    padding: 15px;
    transition: 350ms;

    .thumbnail {
      box-shadow: 0 3px 6px rgba(0, 0, 0, .16), 0 3px 6px rgba(0, 0, 0, .23);
    }

    &:hover {
      transform: scale(1.1);
    }
  }
}

.view-more-link {
  font-size: 1.5rem;
}

.youtube-grid {

  .thumbnail-container {
    padding: 15px;
    transition: 350ms;

    .thumbnail {
      box-shadow: 0 3px 6px rgba(0, 0, 0, .16), 0 3px 6px rgba(0, 0, 0, .23);
    }

    &:hover {
      transform: scale(1.08);
    }
  }
}

.view-more-link {
  font-size: 1.5rem;
}

Tweak transform of youtube image on hover
Tweak transform of youtube image on hover

Reduce slightly to prevent overlapping on larger screens
