Change image alignement

Hi,

I’ve this result with default params: https://gyazo.com/b719590c749abe21904c939a714c0edc

But if possible I want this result: https://gyazo.com/c0f0e62dbc917fe1fdd29dc2d78699e3

I just want align the featured image on the left and define a size by default, eg: 150×150.

I need some help, I’m a beginner in PHP.
Thanks !

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