Hi,
While the plugin includes general styles itself for a simple layout and making it look good with the Storefont theme.
The plugin offers plenty of classes on the elements so you can target them with whatever CSS you would like for your theme.
To target the billing address block to move it down, you could for example use:
.billing_address_book {
padding-top: 20px;
}
To move the buttons down you could use something like.
.add-new-address {
float: none;
display: block;
margin: 5px 0;
}
To target the shipping and billing buttons individually you could use .billing_address_book .add-new-address and .shipping_address_book .add-new-address
