I am at a Susan G Komen walk event. I can’t even begin to tell you how many sales we have just lost because the signup button is directly on top of the check-out button on the mobile!! People can’t purchase our merch!!! How do I get rid of the signup?? This is very frustrating. I wish someone a Shopify spotted this error!!
Somehow this is very funny 
I dont think this is a shopify problem. As I see in your code, you have modified the classes on your own, but anyway. As a short term fix, it should be enough to change the following values in your css classes:
Do the following. go to your code editor and look for this class:
.drip-tab .drip-header {
margin: 0;
padding: 0;
position: fixed;
font-size: 100%;
font: inherit;
z-index: 10000;
color: #333;
vertical-align: baseline;
text-align: left;
-webkit-border-radius: 8px 8px 0 0;
-moz-border-radius: 8px 8px 0 0;
border-radius: 8px 8px 0 0;
-webkit-box-shadow: 0px 10px 28px rgb(0 0 0 / 36%);
-moz-box-shadow: 0px 10px 28px rgba(0,0,0,0.36);
box-shadow: 0px 10px 28px rgb(0 0 0 / 36%);
}
Your z-index for the fanview is 10000, the z-index of your cart is only 100. Change the z-index of the classes mentioned above to a value below 100 and it should overlap this creepy yellow thing.
After this correction it will look like this:
If this helps you, dont forget to like and accept the answer please.
How much does it cost to do this?