below I mentioned the code. Please help me with addtocart button.
{% form 'product', product, class:form_classes, id:addToCartForm, novalidate: 'novalidate', data-product-form: '' %}
{% unless product.has_only_default_variant %}
<div class="product-form__controls-group">
{% for option in product.options_with_values %}
<div class="selector-wrapper js product-form__item">
<label {% if option.name == 'default' %}class="label--hidden" {% endif %}for="SingleOptionSelector-{{ forloop.index0 }}">
{{ option.name }}
</label>
{%assign index = forloop.index %}
<div class="variant-products">
{% for value in option.values %}
<input class="single-option-selector-{{ section.id }}" id="title-{{forloop.index}}" type="radio" name="title" value="{{ value | escape }}" data-index="option{{index}}" {% if option.selected_value == value %} checked {% endif %}/>
<label for="title-{{forloop.index}}">{{value}}</label>
<div style="padding:4px;"></div>
{% endfor %}
</div>
</div>
{% endfor %}
</div>
{% endunless %}
<select name="id" id="ProductSelect-{{ section.id }}" class="product-form__variants no-js">
{% for variant in product.variants %}
<option value="{{ variant.id }}"
{%- if variant == current_variant %} selected="selected" {%- endif -%}
>
{{ variant.title }} - {{ variant.price | money_with_currency }} {%- if variant.available == false %} - {{ 'products.product.sold_out' | t }}{% endif %}
</option>
{% endfor %}
</select>
{% if section.settings.show_quantity_selector %}
<div class="product-form__controls-group">
<div class="product-form__item">
<label for="Quantity-{{ section.id }}">{{ 'products.product.quantity' | t }}</label>
<input type="number" id="Quantity-{{ section.id }}"
name="quantity" value="1" min="1" pattern="[0-9]*"
class="product-form__input product-form__input--quantity" data-quantity-input
>
</div>
</div>
{% endif %}
<div class="product-form__error-message-wrapper product-form__error-message-wrapper--hidden{% if section.settings.enable_payment_button %} product-form__error-message-wrapper--has-payment-button{% endif %}"
data-error-message-wrapper
role="alert"
>
<span class="visually-hidden">{{ 'general.accessibility.error' | t }} </span>
{% include 'icon-error' %}
<span class="product-form__error-message" data-error-message>{{ 'products.product.quantity_minimum_message' | t }}</span>
</div>
<div class="product-form__controls-group product-form__controls-group--submit">
<div class="product-form__item product-form__item--submit
{%- if section.settings.enable_payment_button %} product-form__item--payment-button {%- endif -%}
{%- if product.has_only_default_variant %} product-form__item--no-variants {%- endif -%}"
>
<button type="submit" name="add"
{% unless current_variant.available %} aria-disabled="true"{% endunless %}
aria-label="{% unless current_variant.available %}{{ 'products.product.sold_out' | t }}{% else %}{{ 'products.product.add_to_cart' | t }}{% endunless %}"
class="btn product-form__cart-submit{% if section.settings.enable_payment_button %} btn--secondary-accent{% endif %}"
data-add-to-cart style="background: black;color: white;">
<span data-add-to-cart-text>
{% unless current_variant.available %}
{{ 'products.product.sold_out' | t }}
{% else %}
{{ 'products.product.add_to_cart' | t }}
{% endunless %}
</span>
<span class="hide" data-loader>
{% include 'icon-spinner' %}
</span>
</button>
{% if section.settings.enable_payment_button %}
{{ form | payment_button }}
{% endif %}
</div>
</div>
{% endform %}
</div>
