.vertical-menu {
    width: 500px;
    margin:auto;
}

    .vertical-menu a {
        background-color: #eee;
        color: black;
        display: block;
        padding: 30px;
        margin: 10px;
        text-decoration: none;
        font-size: 35px;
        text-align:center;
    }

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

        .vertical-menu a.active {
            background-color: #4CAF50;
            color: white;
        }
.chart{
    padding: 20px 0;
    zoom:0.7;
}