body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

span {
    cursor: pointer;
}

.side-nav {
    height: 100%;
    width: 0;
    z-index: 1;
    position: fixed;
    top: 0;
    left: 0;
    background: #000;
    overflow-x: hidden;
    transition: 0.5s;
    padding-top: 60px;
}

.side-nav a {
    text-decoration: none;
    padding: 8px 8px 8px 32px;
    font-size: 25px;
    color: #0081cb;
    display: block;
    transition: 0.4s;
}

.side-nav a:hover {
    background-color: #0081cb;
    color: #fff;
}

.closebtn {
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 36px;
    margin-left: 50px;
}

#main {
    transition: margin-left 0.5s;
    padding: 20px;
}

@media screen and (max-height: 550px) {
    .side-nav a {
        font-size: 18px;
    }
}