My homepage’s width has reduced and I can´t fix it [closed]

The widths are the same the problem is that you have this in your compressed.css – Line 55:

.column {
    float: left;
    margin: 0 10px;
    padding: 0;
}

Whenever you float your column left you lose your max-width as it becomes inline. Fix that fix your website. The homepage content, or all the content is in that column class.