help!! changing gallery image margin doesn't work…help !

Hello I am editing photo image margin of below webpage

http://anetteshin.com/photography-2/what-is-fashion/
and I want to reduce space between image

and in the CSS I changed below code

figure {
    margin: 1em 60px;
}

to

figure {
    margin: 1em 30px;
}

but gallery space doesn’t changed. even it shows same parameter as before on inspector.
Jesus….. Do you know how to reduce space? where I need to touch?

Thanks