Change Lightbox Arrow Design

Hi @giovannagiacon,

Inspect the left and right arrow individually and see the ::after, ::before selector in your element for this. Then you can find the CSS that already written for this.
Change the desire values of this CSS and write down on your stylesheet. Make sure you put the !important on your CSS.

Screenshot: https://prnt.sc/soowfi

Example:

.mfp-arrow-left:before {
    margin-left: 25px;
    border-right: 27px solid #000000 !important;
}