Offcanvas menu background not transparent

Question

Website: www.rascomed.com.

When the page is resized, a little menu button pops up in the top menu. The menu button triggers the off-canvas menu. I want the background, as shown on this image, to be transparent, So the user could see the website, and not only a blank canvas.

I just want to add that, the function sometimes works and sometimes it doesn't.

Offcanvas

<div class="offcanvas-menu offcanvas-effect visible-xs">
            <button type="button" class="close" aria-hidden="true" data-toggle="offcanvas" id="off-canvas-close-btn">&times;</button>
            <h3>Sidebar Menu</h3>
            <ul class="list-unstyled">
                <li class="active"><a class="offcanvas-link" href="#page-top">Home<span class="sr-only">(current)</span></a></li>
                <li><a class="offcanvas-link" href="#services">Services &amp; Distribution</a></li>
                <!--<li><a class="offcanvas-link" href="#work">Works</a></li>-->
                <li><a class="offcanvas-link" href="#about">About</a></li>
                <!--<li><a class="offcanvas-link" href="#blog">Blog</a></li>-->
                <li><a class="offcanvas-link" href="#contact">Contact</a></li>
            </ul>
        </div><!-- .offcanvas-menu -->

JS

;
(function ($) {
    $.fn.extend({
        HippoOffCanvasMenu: function (options) {

            this.defaultOptions = {
                documentWrapper: '.hippo-offcanvas-wrapper',
                position       : 'hippo-offcanvas-left', // class name
                //opener         : 'hippo-offcanvas-open', // class name
                effect         : 'slide-on-top',         // class name
                contentWrapper : '.hippo-offcanvas-contents',
                closeButton    : '.hippo-offcanvas-close',
                menuWrapper    : '.hippo-offcanvas-container',  // class name
                documentPusher : '.hippo-offcanvas-pusher'
            };

            var isMobile = function () {
                var check = false;
                (function (a) {
                    if (/(android|ipad|playbook|silk|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i.test(a) || /1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(a.substr(0, 4)))check = true
                })(navigator.userAgent || navigator.vendor || window.opera);
                return check;
            };

            var settings = $.extend({}, this.defaultOptions, options);

            return this.each(function () {

                var $this = $(this);
                var eventType = isMobile() ? 'touchstart' : 'click';

                var transitionEvent = function () {
                    var t, el = document.createElement("fakeelement");

                    var transitions = {
                        "transition"      : "transitionend",
                        "OTransition"     : "oTransitionEnd",
                        "MozTransition"   : "transitionend",
                        "WebkitTransition": "webkitTransitionEnd"
                    }

                    for (t in transitions) {
                        if (el.style[t] !== undefined) {
                            return transitions[t];
                        }
                    }
                }

                var animationEvent = function () {
                    var t, el = document.createElement("fakeelement");

                    var animations = {
                        "animation"      : "animationend",
                        "OAnimation"     : "oAnimationEnd",
                        "MozAnimation"   : "animationend",
                        "WebkitAnimation": "webkitAnimationEnd"
                    }

                    for (t in animations) {
                        if (el.style[t] !== undefined) {
                            return animations[t];
                        }
                    }
                }


                $(settings.documentWrapper)
                    .addClass('hippo-offcanvas-wrapper')
                    .addClass(settings.position)
                    .addClass(settings.effect);

                $(settings.menuWrapper).show();
                $(settings.menuWrapper).addClass('hippo-offcanvas-container');
                $(settings.documentPusher).addClass('hippo-offcanvas-pusher');
                $(settings.contentWrapper).addClass('hippo-offcanvas-contents');

                $(this).on(eventType, function (event) {


                    event.preventDefault();
                    event.stopPropagation();
                    event.stopImmediatePropagation();

                    $(this).addClass('hippo-offcanvas-button-opened');
                    $(settings.documentWrapper).addClass('hippo-offcanvas-open');
                    $('html').addClass('hippo-offcanvas-html-open');
                    $('body').addClass('hippo-offcanvas-body-open');

                    $(window).trigger('hippo-offcanvas-open', [settings, this]);
                });

                $(settings.closeButton).on(eventType, function (event) {

                    event.preventDefault();
                    event.stopPropagation();
                    event.stopImmediatePropagation();

                    $this.removeClass('hippo-offcanvas-button-opened');
                    $(settings.documentWrapper).removeClass('hippo-offcanvas-open');

                    $(window).trigger('hippo-offcanvas-close', [settings, $this]);

                    $(settings.menuWrapper).one(transitionEvent(), function (e) {
                        $('html').removeClass('hippo-offcanvas-html-open');
                        $('body').removeClass('hippo-offcanvas-body-open');

                        $(window).trigger('hippo-offcanvas-closed', [settings]);
                    });

                    $(settings.menuWrapper).one(animationEvent(), function (e) {
                        $('html').removeClass('hippo-offcanvas-html-open');
                        $('body').removeClass('hippo-offcanvas-body-open');

                        $(window).trigger('hippo-offcanvas-closed', [settings]);
                    });
                });

                $(document).on(eventType, function (event) {

                    if (!$(event.target).parents().hasClass('hippo-offcanvas-container')) {

                        $this.removeClass('hippo-offcanvas-button-opened');
                        $(settings.documentWrapper).removeClass('hippo-offcanvas-open');

                        $(window).trigger('hippo-offcanvas-close', [settings, $this]);

                        $(settings.menuWrapper).one(transitionEvent(), function (e) {
                            $('html').removeClass('hippo-offcanvas-html-open');
                            $('body').removeClass('hippo-offcanvas-body-open');

                             $(window).trigger('hippo-offcanvas-closed', [settings]);
                        });

                        $(settings.menuWrapper).one(animationEvent(), function (e) {
                            $('html').removeClass('hippo-offcanvas-html-open');
                        $('body').removeClass('hippo-offcanvas-body-open');

                        $(window).trigger('hippo-offcanvas-closed', [settings]);
                    });
                }
            });
        });
    }
});
})(jQuery);

CSS

.hippo-offcanvas-wrapper,
.hippo-offcanvas-pusher,
.hippo-offcanvas-contents {
    height : 100%;
}

.hippo-offcanvas-contents {
      /* overflow-y : scroll;
   background : #f3efe0; */
}

.hippo-offcanvas-open .hippo-offcanvas-contents,
.hippo-offcanvas-open .hippo-offcanvas-contents-inner {

}

.hippo-offcanvas-html-open, .hippo-offcanvas-body-open{
    height: 100%
}

.hippo-offcanvas-contents,
.hippo-offcanvas-contents-inner {
    position : relative;
}

.hippo-offcanvas-wrapper {
    position : relative;
    overflow : hidden;
}

.hippo-offcanvas-pusher {
    position           : relative;
    left               : 0;
    z-index            : 99;
    height             : 100%;
    -webkit-transition : -webkit-transform 0.5s;
    -moz-transition : -moz-transform 0.5s;
    -ms-transition : -ms-transform 0.5s;
    -o-transition : -o-transform 0.5s;
    transition         : transform 0.5s;
}

.hippo-offcanvas-pusher::after {
    position           : absolute;
    top                : 0;
    right              : 0;
    width              : 0;
    height             : 0;
    background         : rgba(0, 0, 0, 0.5);
    content            : '';
    opacity            : 0;
    -webkit-transition : opacity 0.5s, width 0.1s 0.5s, height 0.1s 0.5s;
    -moz-transition : opacity 0.5s, width 0.1s 0.5s, height 0.1s 0.5s;
    -o-transition : opacity 0.5s, width 0.1s 0.5s, height 0.1s 0.5s;
    transition         : opacity 0.5s, width 0.1s 0.5s, height 0.1s 0.5s;
    z-index: 999;
}

.hippo-offcanvas-open .hippo-offcanvas-pusher::after {
    width              : 100%;
    height             : 100%;
    opacity            : 1;
    -webkit-transition : opacity 0.5s;
    -moz-transition : opacity 0.5s;
    -o-transition : opacity 0.5s;
    transition         : opacity 0.5s;
}

.hippo-offcanvas-container {
    position           : absolute;
    top                : 0;
    left               : 0;
    z-index            : 100;
    visibility         : hidden;
    width              : 300px;
    height             : 100%;
    background         : #27272C; /* Will Change */
    -webkit-transition : all 0.5s;
    -moz-transition : all 0.5s;
    -o-transition : all 0.5s;
    transition         : all 0.5s;
}

.hippo-offcanvas-container::after {
    position           : absolute;
    top                : 0;
    right              : 0;
    width              : 100%;
    height             : 100%;
    background         : rgba(0, 0, 0, 0.5);
    content            : '';
    opacity            : 1;
    -webkit-transition : opacity 0.5s;
    -moz-transition : opacity 0.5s;
    -o-transition : opacity 0.5s;
    transition         : opacity 0.5s;
}

Answer 1

I looked around with inspect element it appears to be the following code that is making the background under the navbar opaque:

.hippo-offcanvas-html-open, .hippo-offcanvas-body-open{
    height: 100%
}

When I disabled the height:100%, the page was visible underneath the popup navbar.