How to remove cryptic indentation in firefox?

Question

css

In general, there was an indent at the very beginning of the page. And it only exists in FF. Other browsers display normally. Styles have been reset. Can anyone come across a similar phenomenon?

So I flooded the site: tyts
Thanks in advance.

Answer 1

#firstBlock {
    margin: 75px auto 0px;
}

Change to

#firstBlock {
    margin: 0px auto 0px;
    padding-top:75px
}

Answer 2

the margin of sibling elements is equal to the largest margin of those elements.
Try replacing it with padding for firstBlock.