add to cart button bootstrap style

woocommerce/loop/add-to-cart.php

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+<?php
+/**
+ * Loop Add to Cart
+ *
+ * This template can be overridden by copying it to yourtheme/woocommerce/loop/add-to-cart.php.
+ *
+ * HOWEVER, on occasion WooCommerce will need to update template files and you
+ * (the theme developer) will need to copy the new files to your theme to
+ * maintain compatibility. We try to do this as little as possible, but it does
+ * happen. When this occurs the version of the template file will be bumped and
+ * the readme will list any important changes.
+ *
+ * @see        https://docs.woocommerce.com/document/template-structure/
+ * @author        WooThemes
+ * @package    WooCommerce/Templates
+ * @version     2.5.0
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+global $product;
+
+echo apply_filters( 'woocommerce_loop_add_to_cart_link',
+	sprintf( '<a rel="nofollow" href="%s" data-quantity="%s" data-product_id="%s" data-product_sku="%s" class="btn btn-outline-primary btn-block">%s</a>',
+		esc_url( $product->add_to_cart_url() ),
+		esc_attr( isset( $quantity ) ? $quantity : 1 ),
+		esc_attr( $product->id ),
+		esc_attr( $product->get_sku() ),
+		// TODO: load add to cart button class from customizer?
+//		esc_attr( isset( $class ) ? $class : 'button' ),
+		esc_html( $product->add_to_cart_text() )
+	),
+	$product );

woocommerce/single-product/add-to-cart/simple.php

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+<?php
+/**
+ * Simple product add to cart
+ *
+ * This template can be overridden by copying it to yourtheme/woocommerce/single-product/add-to-cart/simple.php.
+ *
+ * HOWEVER, on occasion WooCommerce will need to update template files and you
+ * (the theme developer) will need to copy the new files to your theme to
+ * maintain compatibility. We try to do this as little as possible, but it does
+ * happen. When this occurs the version of the template file will be bumped and
+ * the readme will list any important changes.
+ *
+ * @see 	    https://docs.woocommerce.com/document/template-structure/
+ * @author 		WooThemes
+ * @package 	WooCommerce/Templates
+ * @version     2.1.0
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
+global $product;
+
+if ( ! $product->is_purchasable() ) {
+	return;
+}
+
+?>
+
+<?php
+	// Availability
+	$availability      = $product->get_availability();
+	$availability_html = empty( $availability['availability'] ) ? '' : '<p class="stock ' . esc_attr( $availability['class'] ) . '">' . esc_html( $availability['availability'] ) . '</p>';
+
+	echo apply_filters( 'woocommerce_stock_html', $availability_html, $availability['availability'], $product );
+?>
+
+<?php if ( $product->is_in_stock() ) : ?>
+
+	<?php do_action( 'woocommerce_before_add_to_cart_form' ); ?>
+
+	<form class="cart" method="post" enctype='multipart/form-data'>
+	 	<?php do_action( 'woocommerce_before_add_to_cart_button' ); ?>
+
+	 	<?php
+	 		if ( ! $product->is_sold_individually() ) {
+	 			woocommerce_quantity_input( array(
+	 				'min_value'   => apply_filters( 'woocommerce_quantity_input_min', 1, $product ),
+	 				'max_value'   => apply_filters( 'woocommerce_quantity_input_max', $product->backorders_allowed() ? '' : $product->get_stock_quantity(), $product ),
+	 				'input_value' => ( isset( $_POST['quantity'] ) ? wc_stock_amount( $_POST['quantity'] ) : 1 )
+	 			) );
+	 		}
+	 	?>
+
+	 	<input type="hidden" name="add-to-cart" value="<?php echo esc_attr( $product->id ); ?>" />
+
+	 	<button type="submit" class="btn btn-outline-primary"><?php echo esc_html( $product->single_add_to_cart_text() ); ?></button>
+
+		<?php do_action( 'woocommerce_after_add_to_cart_button' ); ?>
+	</form>
+
+	<?php do_action( 'woocommerce_after_add_to_cart_form' ); ?>
+
+<?php endif; ?>