checkout width senttings

i need to settins cheouct page width but how?

You can do that by changing the width of the different elements in the CSS of HikaShop. For example, that code:
.hikashop_checkout_address_left_part {
width: 350px;
float: left;
}

ok thnks but before i researched and found in css i made
not just it there are many settings