.overlay-contentpush {
    background: rgb(170, 170, 170);
    visibility: hidden;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    -webkit-transform: translateX(-100%);
    transform: translateX(-100%);
    -webkit-transition: -webkit-transform 0.5s, visibility 0s 0.5s;
    transition: transform 0.5s, visibility 0s 0.5s;
}

.overlay-contentpush.open {
    visibility: visible;
    -webkit-transform: translateX(0%);
    transform: translateX(0%);
    -webkit-transition: -webkit-transform 0.5s;
    transition: transform 0.5s;
}

@media screen and (max-height: 30.5em) {
    .overlay nav {
        height: 70%;
        font-size: 34px;
    }
    .overlay ul li {
        min-height: 34px;
    }
}