librandi
It due to your custom css code in 'custom.css' file on your site:
.container {
width: 1172px;
padding-top: 30px;
}
when you set the width for container class like this, it will affect all view ports including mobile view.
If you want to set it for desktop only, you should use media queries:
@media (min-width: 768px) {
.container {
width: 1172px;
padding-top: 30px;
}
}
It will not affect mobile view then.