Website content shifted all the way to the left

The Answer by @rudtek went in the right direction. But i see no reason you would need the Padding anyway? It seems like removing

@media (min-width: 922px) {
    .ast-container {
        max-width: 1240px;
    }

fixes the majority of your problem. After that you need to remove

@media (min-width: 922px) {
    .ast-container {
        max-width: 1240px;
    }
}

and the White Border on the left is gone. You complained about the Text not being centered since it shiftet to the left, but this seems to be only subjektiv. If you look at the DOM placement you see that relative to the total Viewport it is indeed now centered