Hi there,
best i can offer is this CSS – to stop the articles from appearing to the side:
.single-post .site-content {
flex-wrap: wrap;
}
@media(min-width: 769px) {
.single-post #content > article, .single-post #content > .post-navigation {
max-width: calc(75% - 80px);
}
.single-post #content > .post-navigation {
width: 100%;
}
}
But you have a lot of other scripts such as adverts that inject code that may cause some interference, not much i can do about that.