.gallery-dialog .gallery-nav{position:fixed;font-size:0;line-height:0}
.gallery-dialog .gallery-nav::before{position:absolute;top:50%;left:50%;width:11px;height:18px;background:currentColor;content:"";transform:translate(-50%,-50%)}
.gallery-dialog .gallery-nav.next::before{clip-path:polygon(0 0,28% 0,100% 50%,28% 100%,0 100%,72% 50%)}
.gallery-dialog .gallery-nav.previous::before{clip-path:polygon(100% 0,72% 0,0 50%,72% 100%,100% 100%,28% 50%)}