Desktop is displaying correctly, but mobile looks like crap.

Hello,

So you will need to adjust your CSS rules for your template and HikaShop in order to change the display in small device screen.
www.hikashop.com/support/documentation/1...the-display.html#css

Regards,

We actually do have specific CSS to display properly on mobile devices.
Switch to the default template of Joomla and you'll see that it will display fine there.
Which means that the issue comes from your Joomla template CSS and that it will require to add CSS to counter act the CSS of the template which creates the problem and maybe remove or modify some CSS in your template.
Unfortunately, the link you provided doesn't work monosnap.com/file/p5TMTqfYc7uMEwHWzhYqKjrBb18TTz so we don't have any way to look at the issue and it's not even an issue we should be helping with.

Hello,

Please note that the link you gave is really not working ; and it really does provide a 404 page.
You do not anymore a menu for the checkout so the link is "/component/hikashop/checkout".
You current account do not have an HikaShop license ; you might have buy HikaShop Business with another account but that current one do not have it.

So please, before criticism the fact that we answer to hundred of message each day in that forum including people with no license ; be sure that the tone of your first message and the thread subject is appropriate.
We are humans... and if you look at my signature, you'll see that I'm just helping here...

Well !

If you check the frontend_default CSS, you see one with with have a conflict with the rest of your CSS.

	.hikashop_checkout_cart table td:before {
		position: absolute;
		left: 6px;
		padding-right: 10px;
	}

Hi,

There was nothing to answer.
Jerome was only pointing to the fact that you might have a subscription with another account but that regardless manners are important.
Moreover, Jerome already gave you the exact solution to your problem:

If you check the frontend_default CSS, you see one with with have a conflict with the rest of your CSS.

.hikashop_checkout_cart table td:before {
position: absolute;
left: 6px;
padding-right: 10px;
}
By removing the "position: absolute" the display will be become better.

Hello,

I'm afraid that there is no need of any kind of acknowledgement. in our side.
Like I wrote

You current account do not have an HikaShop license ; you might have buy HikaShop Business with another account but that current one do not have it.

Sure

Hello,

In my very first answer, I gave you the documentation link which explain how to customize HikaShop display ; including the CSS and where to create overrides :
www.hikashop.com/support/documentation/1...the-display.html#css

Regards,