.ui-popup {
    display: none;
}

    .ui-popup.is-open {
        display: block;
    }

/* menu latéral */
.ui-popup-side {
    position: fixed;
    top: 0;
    left: -260px;
    width: 260px;
    height: 100%;
    background: #fff;
    transition: left 0.25s ease;
    z-index: 2000;
}

    .ui-popup-side.is-open {
        left: 0;
    }