/* Add a black background color to the top navigation */
.topnav {    
    background-image: linear-gradient(grey, lightgrey);
    overflow: hidden;
}

/* Style the links inside the navigation bar */
.topnav a {
    float: left;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
}

/* Change the color of links on hover */
.topnav a:hover {
    background-color: #ddd;
    color: black;
}

/* Add a color to the active/current link */
.topnav a.active {
    background-color: #4CAF50;
    color: white;
}

table#t01 {
    width: 100%;
    background-color: white;
    text-align: center;
}

table#t01 tr:nth-child(even) {
    background-color: lightblue;
}

table#t01 tr:nth-child(odd) {
    background-color: white;
}

table#t01 th {
    padding: 15px;
}

.boxed {
    border: 1px solid green;
    width: 80%;
    box-align: center;
    text-align: center;
}