Hello,

The style in the demo is not available anymore as it is an old version of the theme. If you want to have that, then please go to Blog Config > Blog Style and select the ‘Alternate’ style.
Then add this code into your custom css box:

.fullwidth .blog-article.alternate-style .media {
    width: 990px !important;
    top: 0;
    left: 0;
}
.fullwidth .blog-article.alternate-style .content {
    width: 990px !important;
}

Merry Christmas and Happy New year!