Thumbnails too small on blog page

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Hi

The thumbnail images of the posts’ featured image on my blog page are too small and I can’t work out how to make them bigger.

I’ve tried resizing thumbnails in the WP dashboard to 150×150. Does that only affect new images? If so, how do I adjust the existing thumbnails?

Also, I’d like to get rid of the padding at the bottom of the images.

I’ve tried a bit of CSS to get rid of the padding but no luck:

.entry-thumb img {
padding-bottom: 0px;
}

Any tips would be appreciated!

The page I need help with: [log in to see the link]

 

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