How can I change the thumbnail image size

Sure, that can be done with the following CSS:

.entry .featured-image {
  padding-bottom: 60%;
}

Copy & paste the code above into the “Custom CSS” section in the Customizer (Appearance > Customize), and it should take affect right away.

If you haven’t seen it already, you should also check out the Tracks CSS Snippets collection: https://www.competethemes.com/help/tracks-css-snippets/

It’s full of similar CSS snippets you can copy & paste to customize your site.

sorry I mean in the posts page(home page), I want to use the height of the featured image in the post and apply it in the thumbnail.

How can I change the height of it in the home page?

Thanks!

I’m afraid that’s not as easily done. The height of the images on the homepage is dependent on the content on the other side of the post (title & excerpt). However, the posts could be given a minimum height to accommodate the images.

I understand. I already have fix the problem by changing the image itself + the snippet you provided.

Thanks for your help.

Okay great, no problem ??