@media screen and (max-width: 768px) {
    .wpDiscourseOffCanvasWidth   {
        width: 100%;
    }
}
@media screen and (min-width: 900px) {
    .wpDiscourseOffCanvasWidth {
        width: 60%;
    }
}

@media (max-width: 575px) {
 
    .wpDiscourseOffCanvasWidth {
        width: 100%;
    }
}