Hi,

If you want to improve the colors & font-size, you need to use custom CSS.

For example

.article-details .article-info > span {
  color: black; font-size: 13px;
}

To reduce blocks height , use that

.article-list .article {
  margin-bottom: 20px;
  padding: 20px 20px 25px;
  height: auto;
  min-height: 330px;
}

if you know the class names, you can do anything else, right.

Next time please write more details... so I don't have to guess. Mock-up maybe