.header {
    background-color: #f1f1f1;
    text-align: center;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.content {
    max-width: 1200px;
    margin: auto;
}

#navbar {
    overflow: hidden;
    background-color:slategrey;
}

    #navbar a {
        float: left;
        display: block;
        color: #f2f2f2;
        text-align: center;
        padding: 14px 16px;
        text-decoration: none;
        font-size: 17px;
        border-bottom: 3px solid transparent;
    }

        #navbar a:hover {
           
            border-bottom: 3px solid green;
        }

        #navbar a.active {
            background-color: #4CAF50;
            color: white;
        }

.content {
    padding: 0px;
}

.sticky {
    position: fixed;
    top: 0;
    width: 100%;
}

    .sticky + .content {
        padding-top: 60px;
    }

.vertical-menu {
    width: 300px;
 
}

    .vertical-menu a {
        background-color: #eee;
        color: black;
        display: block;
        padding: 5px;
        text-decoration: none;
        font-size:20px;
       
    }

        .vertical-menu a:hover {
            background-color: #ccc;
        }

        .vertical-menu a.active {
            background-color: #4CAF50;
            color: white;
        }

.menux {
    display: none;
}
.mainopen {
    display: none;
 
}
@media screen and (max-width: 1600px) {
            .vertical-menu {
               display:none;
            }
         .mainopen{
             display:block;
         }
}
@media screen and (max-width: 600px) {
    .vertical-menu {
        display: none;
    }

    .menux {
        display: block;
        float: right
    }

    .mainopen {
        display: none;
    }
}

.overlay {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 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: 36px;
    color: #818181;
    display: block;
    transition: 0.3s;
}

    .overlay a:hover, .overlay a:focus {
        color: #f1f1f1;
    }

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

@media screen and (max-height: 450px) {
    .overlay a {
        font-size: 20px
    }

    .overlay .closebtn {
        font-size: 40px;
        top: 15px;
        right: 35px;
    }
}

.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;
}

    .sidenav a {
        padding: 8px 8px 8px 32px;
        text-decoration: none;
        font-size: 25px;
        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: 50px;
    }

#mainx {
    transition: margin-left .5s;
    padding: 0px;
}

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

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