How do I include an 'empty cart' button in the refresh theme?

[Totalmann]

Hi,

How du I add an "empty cart" button to the refresh theme?

I tried tis code on line 29 in section > main-cart-items.liquid: 

<a href="/cart/clear" class="btn button" style="margin-bottom:10px;">Empty cart</a>

It had no effect. 

Help please 😄