WooCommerce Percentage Sale Badge

<?php
if ( ! class_exists( 'WooCommerce' ) ) { return; }

add_filter( 'woocommerce_sale_flash', 'scseed_percent_badge', 10, 3 );
function scseed_percent_badge( $text, $post, $product ) {
    if ( $product->is_type( 'variable' ) ) {
        $percentages = array();
        $prices = $product->get_variation_prices();
        if ( ! empty( $prices['regular_price'] ) ) {
            foreach ( $prices['regular_price'] as $id => $regular ) {
                $sale = isset( $prices['sale_price'][ $id ] ) ? (float) $prices['sale_price'][ $id ] : 0;
                if ( $sale && (float) $regular > 0 ) {
                    $percentages[] = round( ( ( (float) $regular - $sale ) / (float) $regular ) * 100 );
                }
            }
        }
        if ( empty( $percentages ) ) { return $text; }
        $pct = max( $percentages );
    } else {
        $regular = (float) $product->get_regular_price();
        $sale    = (float) $product->get_sale_price();
        if ( ! $regular ) { return $text; }
        $pct = round( ( ( $regular - $sale ) / $regular ) * 100 );
    }
    return '<span class="scseed-sale-badge">-' . absint( $pct ) . '%</span>';
}

.scseed-sale-badge {
    display: inline-block;
    background: #e74c3c;
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 3px;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    line-height: 1.5;
}
.woocommerce ul.products li.product .scseed-sale-badge {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    z-index: 2;
}