I bought the Pro Version: CSS question

Hi,

Yes , you can make it flexible , Use this CSS

.xoo-wsc-body {
    height:  auto!important;
}

.xoo-wsc-footer {
    position:  relative;
}

.xoo-wsc-container {
    background-color: transparent;
    overflow: auto;
}

Set background colors , if the cart gets transparent.
For more premium related queries , please use live chat feature on site.

.xoo-wsc-basket{position: absolute;}

You want the basket icon to scroll , as you scroll the page? right !
That should do the job.

This feature is by default. It either stays on the top or bottom.
Check side cart settings. There is an option for adjusting position.

Select TOP FIXED & use this CSS

.xoo-wsc-basket {
    top: 100px;
}