instead of grid lets do flex

find this

.shoppingcart {
grid-template-columns: auto auto auto; <!--- remove this -->
text-align: center;
gap: 1.5rem;
margin-top: 0px;

replace with


.shoppingcart {
display:flex <!-- this will solve your issue -->
text-align: center;
gap:1.5rem;
margin-top: 0px;