Hello,

Please try adding the following Custom CSS in the Global Custom CSS area under Theme Settings >> Custom CSS.

.labels-rectangular span.onsale.product-label {
    top: 30px !important;
    left: 0 !important;
}
.product-label.onsale {
    position: absolute;
    top: 5px !important;
    left: 5px !important;
}

Regards.
Xtemos Studios.