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Theoretically: the input box is activated and the input method pops up. As a result, the visible area of ??the browser becomes smaller (the window becomes smaller), so it is normal for fixed elements to be pushed up.

If you think this is a bug, you can not fix it; or: hide the button when the input box is activated.

This should be a problem with the input box

This is a normal phenomenon of fixed. Generally, my method is to use a jQuery method to control it;
As follows:

$(function(){
    //焦點(diǎn)時(shí)隱藏
    $("input").on("focus",function(){
        $(".submit").hide();
    });
    //失去焦點(diǎn)時(shí)顯示
    $("input").on("blur",function(){
        $(".submit").show();
    });
})

Normal phenomenon: You can reload the same page and do a little processing on it. Personal opinion: You can also display:none the element that will be pushed up when the input box gains focus, and then display:none when the input method is closed (or the input loses focus)