.navbar-collapse {
        position: absolute;
        top: 54px;
        left: -100%;
        width: 100%;
        transition: all 0.4s ease;
        display: block;
        opacity: 0.8;
    }
    .navbar-collapse.collapsing {
        height: auto !important;
        left: -100%;
        margin-left: 1px;
        transition: all 0.2s ease;
        opacity: 0.9;
    }
    .navbar-collapse.show {
        margin-left: 100%;
        transition: all 0.2s ease;
        opacity: 1;
    }