How to adjust the height of the blog thumbnail?

1. Open "/includes/theme-functions.php" file then find this code:

add_image_size( 'theme-blog-thumbnail', 750, 200, true );
add_image_size( 'theme-blog-thumbnail-full', 1020, 220, true );

Change from "200" and "220" to your new height number. You can use "9999" for infinite height (depending on the uploaded image).

2. Open "style.css" file and find this CSS:

.blog-item-thumbnail {
	margin-bottom: 30px;
	height: 200px;
	overflow: hidden;

.blog-item-thumbnail.full {
	height: 220px;

Change from "height" to "min-height" for these two CSS selectors.

3. Re-upload all the image thumbnails for the blog posts (or you can use "Regenerate Thumbnails" plugin to regenerate them). This makes WordPress to recreate the image and use the adjusted size in step 1.