body {
    margin: 0;
    padding: 0;
    background: #fff;
    font-family: "Helvetica Neue", "Lucida Grande", "Segoe UI", Arial, Helvetica, Verdana, sans-serif;
    font-size: 15px;
}

.page {
    width: 1000px;
    background-color: #fff;
    margin: 0 auto 0 auto;
}

.main {
    position: relative;
    margin-top: 20px;
}
    .sidenav {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: #111;
    overflow-x: hidden;
    transition: 0.5s;
    padding-top: 60px;
}

.Head_balk {
   background-color: #fff;
    margin: 0 auto 0 auto;
    height: 50px;
    width: 100%;
    margin: 0;
    position: relative
}

    .sidenav a {
        padding: 8px 3px 8px 8px;
        text-decoration: none;
        font-size: 30px;
        color: #818181;
        display: block;
        transition: 0.3s;
    }

        .sidenav a:hover {
            color: #f1f1f1;
        }

    .sidenav .closebtn {
        position: absolute;
        top: 0;
        right: 25px;
        font-size: 36px;
        margin-left: 20px;
    }

@media only screen and (max-height: 450px) {
    .sidenav {
        padding-top: 15px;
    }

        .sidenav a {
            font-size: 18px;
        }
}

@media only screen and (max-width:1100px) {
    .page {
        width: 95%;
    }
}

@media only screen and (max-width:25em) {
    .page {
        width: 95%;
    }
}