How to centre image gallery or collage section in testament?

Store Design
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10

@Lisagraphics - remove previous and add this, this will work

@media screen and (min-width:750px){
#shopify-section-template--16088029135033__01c9e9aa-531b-4131-bf4a-a4fc3bf9a453 .grid__wrapper.row{display: flex; grid-gap: 0; justify-content: center;}
#shopify-section-template--16088029135033__01c9e9aa-531b-4131-bf4a-a4fc3bf9a453 .gallery__item{padding:1%; flex-basis: 23%;}
}