Change Floating Top Offset

I’m trying to change the offset for the floating bar so it starts lower down the page. I tried adding the following to the custom css box (changing the default 100px to 500px) but it didn’t change anything.

element.style {
width: 44px;
left: -10px;
top: 500px;
-webkit-box-shadow: none;
-moz-box-shadow: none;
box-shadow: none;
}

Can you tell me what I need to add and where?

Thanks

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