How to avoid dom flickering?

Try hiding your button div onload and once the position is set, show the button div

Hi rondev !
I don't really command JS or HTML. I tried adding this to each question but it's not working:
Qualtrics.SurveyEngine.addOnload(function() {

    $('NextButton').hide();
});


Qualtrics.SurveyEngine.addOnReady(function()
{
// First: find the button object itself
var Button = document.getElementById("NextButton");


//In order to change it's horizontal position, we first need to find the "box" holding the button.
var ButtonContainer = Button.parentNode;

ButtonContainer.style.textAlign = Qualtrics.SurveyEngine.getEmbeddedData("Alignment");
 
$('NextButton').show();
});

rondev I added it at the beginning and after the current code I have in CSS (Look & Feel) plus the code I posted before in individual questions...but still not working.
CSS (Look & Feel)

Qualtrics.SurveyEngine.setEmbeddedData("Alignment",alignment);
#NextButton{display:none}