Customise Product Block title and price

#1. Add to Design > Custom CSS

/* Product block title */
.product-block .productDetails .product-title {
    font-size: 2.1em !important;
    color: #f1f !important;
    line-height: 19px !important;
}

#2. Use this CSS

/* product block price */
.product-block .productDetails .product-price {
    font-size: 0.5em !important;
    color: red !important;
}

#3. Use this CSS

/* product block title price */
.product-block .productDetails .product-title, .product-block .product-price {
    font-family: 'Barlow Light' !important;
}