Hello,
Try to add the following code snippet to the Custom CSS area in Theme Settings to fix issue with font and to change price color.
header .widget_shopping_cart .total .amount{
font-family: "Open Sans",Arial,Helvetica,sans-serif;
}
.single-product-content .price .amount,
.widget_shopping_cart .product_list_widget li .quantity .amount,
.widget_shopping_cart .widget_shopping_cart_content>.total .amount,
.woocommerce-checkout-review-order-table tfoot .order-total td .amount{
color: #000 !important;
}
Thank you for reporting about this font issue. We will fix it in our next theme update for sure.
Kind Regards
XTemos Studio