.top {
    top: 0px;
    position: fixed;
    background-color: #036fab;
    color: white;
    padding: 5px;
    height: 70px;
    width: calc(100% - 250px);
    left: 250px;
    z-index: 1;   
    display: flex;
    align-items: center;    
    transition: 0.3s;
    justify-content: space-between;
}

.left {        
    position: fixed;
    float: left;
    left: 0px;
    top: 0px;
    z-index: 1;   
    background-color: #222d32;
    width: 250px;
    height: 100vh;
    min-height: 100vh;
    transition: 0.3s;
}

.left_content {
    background-color: #f1f1f1;
    padding: 5px;    
    top: 70px;    
    position: absolute;
    left: 250px;
    height: calc(100vh - 70px);
    width: calc(100% - 250px);
    transition: 0.3s;    
}

#bottom {
    position: relative;
    background-color: #c2dfef;
    padding: 5px;
    margin: 10px 0px 0px 0px;
}


#right {
    float: right;
    background-color: #ece3a5;
    padding: 5px;
    width: 150px;
}

.center_content {
    position: relative;
    background-color: #dddddd;
    padding: 5px;
}


.right_content {
    background-color: #dddddd;
    padding: 5px;
    margin: 0px 170px 0px 170px;
}

.top a:link, .top a:visited {
    color: white;
    font-weight : bold;
    text-decoration: none;
}

.top a:link:hover, .top a:visited:hover  {
    color: black;
    font-weight : bold;
    text-decoration : underline;
}

@media screen and (max-width: 992px) {
    .left {
        left: -250px;        
    }

    .top{        
        left: 0px;
        width: 100%
    }


    .left_content{
        left: 0px;
        width: 100%;
    }

    .menu-button{
        display: block;
    }

    .closebtn{
        display: block;
    }
}