Please someone help with CSS

How do I move it to the left?

This should work:

@media screen and (min-width: 61.5625em) {
    body:not(.search-results) article:not(.type-page) .entry-content {
        float: none;
        width: 100%;
    }
}

The float:none line of code moves it to the left.

The width:100% line of code extends the width of your blog posts to 100% of its container (default is 71.42857144%).