How to change the image size on a single posts?

I want that de single post shows a little image. How can I do it?
This is an example: http://joancardoner.cat/wordpress/2013/ ... ost-found/

I want a little image.

Thanks

Hello,

Try to add the following code into the theme’s css/override.css file (make sure to enable the “Use the override.css file” option in Template options > Advanced in the WordPress backend)

Code: Select all

article figure.featured-image img {   
   width: auto;
}

Ok! Fantastic!