On the right there is a strip of 17 pixels.
I do not understand the code. I am learning English.
That's the scrollbar. And this also answers your previous comment.
You can do anything
No, It's not scrollbar.That's is padding-right: 17px
<body class="js modal-open" style="padding-right: 17px;">
padding-right: 0px !important;
Yet this doesn't happen when that line is not applied. It is the scrollbar that causes that issue.