full-menu.css

/* MENU */
.overlay {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 999;
    left: 0;
    top: 0;
    background-color: rgb(0,0,0);
    background-color: rgba(0,0,0, 0.9);
    overflow-x: hidden;
    transition: 0.5s;
    
}

.overlay-content {
    position: relative;
    top: 25%;
    width: 100%;
    text-align: center;
    margin-top: 30px;
}

.overlay a {
    padding: 8px;
    text-decoration: none;
    font-size: 64px;
    color: #818181;
    display: block;
    transition: 0.3s;
    font-family: 'Uncial Antiqua', cursive;
    
}

.overlay a:hover, .overlay a:focus {
    color: #f1f1f1;
    font-size: 70px;
}

.overlay .closebtn {
    position: absolute;
    top: 20px;
    right: 45px;
    font-size: 60px;
}

span {
    cursor: crosshair;
}
@media screen and (max-height: 450px) {
    .overlay a { font-size: 20px }
    .overlay .closebtn {
        font-size: 40px;
        top: 15px;
        right: 35px;
    }
}