/**/
table.c4 {
    width: 10%;
    margin-left: 20%
    }
td.c3 {
    border-right: 1px solid black
    }
td.c2 {
    border-bottom: 1px solid black
    }
td.c1 {
    border-right: 1px solid black;
    border-bottom: 1px solid black
    }
/**/