body {margin: 0px; height: 100vh;
background-image: url(picture.jpg)
}
#mytable {border-width: 80%; margin: auto;
    border-collapse: collapse;
    border: 5px solid black;
}
#mytable>thead>tr>td {
    font-size: 30px;
padding: 2px 0px;
}

#mytable>thead>tr{background-color: darkcyan;}

#mytable>colgroup>col:nth-child(1) {background-color: #add8e6;}
#mytable>colgroup>col:nth-child(2) {background-color: lightseagreen;}
#mytable>colgroup>col:nth-child(3) {background-color: powderblue;}
#mytable>colgroup>col:nth-child(4) {background-color: paleturquoise;}
#mytable>colgroup>col:nth-child(5) {background-color: turquoise;}

#mytable>caption {text-align: right; font-size: small; caption-side: bottom;}
#mytable>tbody>tr>td {font-size: 24px; border: 2px solid black;}