Remove padding around image within a post

That space is from this CSS – line 351:

.size-full {
    display: block;
    margin: 0 25px 230px 0;
}

Thank you! I am just learning how to use CSS so pardon my ignorance… would I change it to something like the below?
.size-full {
display: block;
margin: 0 10px 10 px 0;
}

Yes, try that and see what happens!

It worked! Thank you so much!