.sidr {
    display: block;
    position: fixed;
    top: 0;
    height: 100%;
    z-index: 999999;
    width: 85%;
    overflow-x: hidden;
    overflow-y: auto
}

.sidr.right {
    left: auto;
    right: -85%;
}

.sidr.left {
    left: -260px;
    right: auto
}

@media screen and (min-width: 768px) {
    .sidr {
        width: 45%;
    }

    .sidr.right {
        right: -45%;
    }
}