how can I align gallery "next" "previous" button

Site URL: https://purple-apricots-8amn.squarespace.com/config/pages

Hi!

how can I align gallery "next" "previous" button to above img?

I'm looking forward help. Thanks!

PASSWORD IS 

youngsim79

Add to Design > Custom CSS

/* align portfolio pagination */
.item-pagination[data-collection-type^="portfolio"] {
    max-width: 1000px;
    margin: 0 auto;
}
body {
    background-color: white;
}