***  at first increase the wrapper width ***

.wrap {
max-width: 1145px;
padding-left: 3em;
padding-right: 3em;
}



*** 2nd — increase  left side content section width ***

#primary {
width: 70% !important;
}

*** 3rd — decrease  right sidebar width ***

.has-sidebar #secondary {
width: 26% !important;
}