"add to cart" does not open in mobile view on the site

Hi @emirdekoratif,

In order to show the Add to cart button, you can use one of these 2 ways below:

No.1: Use the css code. Put into the Theme Options and remember to back up the code before updating the theme:
.armania-mobile-style-01.single-product .entry-summary .added_to_cart, .armania-mobile-style-01.single-product .entry-summary .product-buy-now, .armania-mobile-style-01.single-product .entry-summary .single_add_to_cart_button{
-webkit-transform: translateY(-60px);
-moz-transform: translateY(-60px);
-ms-transform: translateY(-60px);
-o-transform: translateY(-60px);
transform: translateY(-60px);
}

No.2: You can use the second layout so that the button will always show at the bottom of the page: https://prnt.sc/vbnn4k
Pls check and let me know
Regards,
Yame

Where exactly do I put this css code?

No.1: Use the css code. Put into the Theme Options and remember to back up the code before updating the theme:
.armania-mobile-style-01.single-product .entry-summary .added_to_cart, .armania-mobile-style-01.single-product .entry-summary .product-buy-now, .armania-mobile-style-01.single-product .entry-summary .single_add_to_cart_button{
-webkit-transform: translateY(-60px);
-moz-transform: translateY(-60px);
-ms-transform: translateY(-60px);
-o-transform: translateY(-60px);
transform: translateY(-60px);
}