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Need help to find id of a specific element (external) to override styling by CSS

I'm trying to modify (by CSS) the dark gray "Contact Us" button that's at the bottom right side of the following site: coloraddicted.com.
This is a button created by an external app, so the code is inaccessible. I only have the following (external) page to refer to for the possibility of finding the right id: https://icf.improvely.com/icf-button.js?v=1479350309&shop=coloraddicted-com.myshopify.com
How can I find the "id" of the specific element in order to apply the
"overriding" CSS to it?
BTW, I have already tried several versions of the id's I see on the above mentioned external page but still haven't found the right one.
I can't remember all of them, but some I have already tried are:
#icf_button
#icf.click_button
#icf_contact_form button {
#icf_contact_form add_button {

Style Contact button by css has no effect, because right after user hover, js code excuted & override on.
You can put js code at the end of the body, to re-override on the library code (not the good way, but have to), example
let contactButton = document.querySelector('#shop-colorful-products-printed-on-demand-just-for-you > div:nth-child(38)');
contactButton.style.backgroundColor = 'white';
Demo image https://tinker.press/images/change-style-by-js-to-override-2017-01-17_090946.png

If you can't modify the button.js script you linked to, I don't think you can target this (reliably) in CSS. They style everything with that button using inline styles and just append it to body.
You could potentially use :nth-of-type (like https://icf.improvely.com/icf-button.js?v=1479350309&shop=coloraddicted-com.myshopify.com) but that would be super unreliable as I'm assuming you have a bunch of scripts and stuff on the site that dynamically append to the page, creating a variable number of divs as direct descendants of body. FWIW, nth-of-type(13) worked for me.

The element doesn't have an id, so you can't select it that way. But the site appears to be using jQuery, so you could try using :contains() to target the element based on its contents:
$( "div:contains('Contact Us')" ).css( "font-size", "2em" );
But that would target any div containing the text "Contact Us". You can use :filter to select divs that contain only the text "Contact Us":
$("div").filter(function() {
return $.trim($(this).text()) === "Contact Us";
}).css("font-size", "2em");
You could use jQuery to either apply CSS directly, or to give the element an id. This solution is kind of kludgy, but might work in a pinch.

Access class with specific text content and display:none

I have a large Joomla CMS Website I'm working on.
Problem: I need to hide a menu tab globally across the entire site. The menu item I need to have does not have a unique ID or class; but instead shares the same class as the other tabs I need to keep on the page. 70% of the tab I need to remove shows in 4th order so I started with the below.
.tabs:nth-of-type(4)
{
display:none !important;
}
But! Seeing as how the rest is in different order, this wont work. The tab in question I need to remove looks like the below across the mark-up.
Update: This is what I currently have via the suggestions below but it isn't working:
$(document).ready(function() {
$('.djaccTitle:contains("Location").css( "display: none;" )')
});
<span class="tabs">Location</span>
Is there a way to write an if statement or similar lightweight solution that can sniff out text content within the class, so if it says Location, then hide?
I would like to find a solution like this, as opposed to going through 1000 files of mark-up removing manually. Cheers for any pointers
Update: This is what I have via the current suggestions below but it isn't working!
$(document).ready(function() {
$('.tabs:contains("Location").css( "display: none;" )')
});

I do not believe what you are asking for exists with pure CSS at this time.
What I would do is use jQuery's :contains() selector:
$('span.tabs:contains("Location")')
or even better:
$('#idOfTabsContainer span.tabs:contains("Location")')
And of course, don't forget to put this in a document.ready to ensure that your DOM element has been loaded successfully:
$(document).ready(function() {
$('#idOfTabsContainer span.tabs:contains("Location")')
});

Jquery :contains() Selector should work. I think you have an error in .css() function syntax.
Please try with:
jQuery(document).ready(function(){
$( '.tabs:contains("Location")' ).css( 'display', 'none' );
});
Hope this helps

There used to be a :contains selector that they were going to add to CSS.
But alas, you may have to resort to some JS, as addressed already here
jQuery's got your back though:
$('.tabs:contains("Location")')

Problem: I need to hide a menu tab globally across the entire site.
Solution 1: Disable the menu item. Boom, it is gone from your menus, site wide.
Solution 2: Hide the menu item with css by adding a unique class to the menu item itself and then hiding it with css.
.hide-me-with-css {display: none;}

JavaScript toggle button only works on second click if display attribute is in header

I came across an interesting quirk, and was wondering if anyone could help me understand it. A simple JavaScript-driven toggle button, as below, works beautifully if the display:none of the toggled element is contained in-line. However, when I move the CSS statement to the <style> tag in the header, or to a separate CSS file, it starts to toggle only on the second click, and from then on, it works fine, on a single-click-per-toggle basis. Here's the JS function:
<script>
function openSec(ordinal) {
var tab_name = "sec" + ordinal;
if (document.getElementById(tab_name).style.display == "none") {
document.getElementById(tab_name).style.display = "table";
} else {
document.getElementById(tab_name).style.display = "none";
}
}
</script>

When the CSS statement is in the style tag, it no longer exists as an attribute of the DOM element that is getting clicked. The browser is still applying the style, but the DOM element no longer has that value as a style attribute. So the first click, there is no display:none, so it adds it, then on the second click it replace it with table.
Use your browser's dev tools (or something like Firebug) to examine the initial HTML, then examine it again after the first click and I think you will see a difference.

How to modify TEXT style in text('TEXT').appendTo('body');

In this bit of code, how can I modify the style of 'TEXT'?
}).text('TEXT').appendTo('body');
This is part of a longer code. TEXT is a link, when you click on it images open in fullscreen (it's part of galleria). However, the TEXT doesn't behave as a link (ie. no hover effect etc.), it is only defined by body { } in the CSS file.
How can I add the appropriate CSS class?
Thanks a lot!
And the full code:
<script>
Galleria.loadTheme('galleria/themes/classic/galleria.classic.js');
Galleria.run('#galleria');
$('<a>').click(function(e) {
Galleria.configure({trueFullscreen:false});
Galleria.ready(function(){this.enterFullscreen();});
}).text('Switch to fullscreen').appendTo('body');
</script>

.text('Switch to fullscreen').appendTo('body').css("color","blue").hover(function() {$(this).css("color","violet");}, function() {$(this).css("color","blue");});
Just add this jquery chain with your code. css adds style to the object and hover function is called when you enter and leave the text.
Karthik

create css class on the fly in codebehind

I have a search page that is used in multiple places with multiple 'themes' throughout my site. I have a few divs that can have their background color changed based on a radio button selection (whether they are enabled or not). I can do this just fine by changing the css class of the div on the fly with javascript.
However, these themes could potentially change, and the background color is grabbed from a database when the page is created. Right now I do this in the C# codebehind:
string bgStyle = "background-color:" +theme.searchTextHeaderColor +";";
OwnerSearchHeader.Attributes.Add("style", bgStyle);
In the Javascript I need to change this color to make it look disabled, and when the user clicks back to this div I need to re-enable it by changing it back to its original color. But since I only knew this color in the code-behind, I don't know what it was in the Javascript.
So my thought was to create a css class in the resulting HTML page when the page is loaded with the background color I need. Then I could simply switch from the divEnabled and divDisabled class in the javascript. But I'm not exactly sure how to do that.
Alternatively I could create a hidden element, assign it the 'enabled' style, and use that as a reference in the JavaScript when enabling my div. This seems like a hack but maybe its the easiest way. I'm still new to a lot of this, so I'd appreciate any suggestions. Thanks for the input!

So my thought was to create a css class in the resulting HTML page when the page is loaded with the background color I need. Then I could simply switch from the divEnabled and divDisabled class in the javascript. But I'm not exactly sure how to do that.
Yes, this is the anser; do this. In the <head> of your document add a <style> and put your CSS in there like so: (my Asp.NET is a little rusty so forgive me if it has some hicups ;) )
<style>
<!--
.divEnabled {
background-color:<%=theme.searchTextHeaderColor%>;
}
.divDisabled {
background-color:gray; /* or wtv */
}
-->
</style>
You could also put it in an external CSS file, which may be a good idea.
Then write some JavaScript to add/remove the class attribute (I'm going to ask that you don't call is the "CSS Class" ;) )
var ownersearchheader = document.getElementById("<%=OwnerSearchHeader.ClientId%>");
// changing the class attribute to `divDisabled`
var newClassAttribute = ownersearchheader.getAttribute("class").replace(/\bdivEnabled\b/, "divDisabled")
ownersearchheader.setAttribute("class", newClassAttribute);
// ... or,
// changing the class attribute to `divEnabled`
var newClassAttribute = ownersearchheader.getAttribute("class").replace(/\bdivDisabled\b/, "divEnabled")
ownersearchheader.setAttribute("class", newClassAttribute);
This is indeed a mouthfull, so, like #Haydar says, you might want to use jQuery, which offers easy-as-pie addClass(), removeClass() and toggleClass() methods.

You can use the jquery .toggleClass method.
Description: Add or remove one or more classes from each element in the set of matched elements, depending on either the class's presence or the value of the switch argument.
Here is the link to the api doc.
Jquery API