Expand line code to fit either side of the viewport

Site URL: https://endive-denim-89ds.squarespace.com/

Hi all!

I am trying to create a title effect with a line animation that comes from either the left or the right side of the viewport. I thought I successfully made it work, but when my colleagues watch the website on their large screen (2560x1440) the lines stop before reaching the side of the viewport. 

Here is the markdown block I've made for the left lines:

<div style="text-align: right">We produce a new standard<br>of 3D films and images
======================================================
</div>
<hr style="height:2px !important;  margin-left: -400px !important; width: auto !important; background-color: #000000 !important; margin-top: -30px;">

Here is the markdown block I've made for the right lines:

Implementing/Performing into<br>the luxury driven culture
======================================================
<hr style="height:2px !important; width: 126.5% !important; background-color: #000000 !important; margin-top: -30px;">

Also, it seems like there is unnecessary margin on the right side of each page (this only shows when you scroll to the side). Is that normal?

Thank you for your help!!