.b {background-color:black;color:white;text-align:center;}
.r {background-color:blue;color:white;text-align:center;}
.t {background-color:yellow;text-align:center;}
.s {background-color:lime;text-align:center;}
.bi {font-size:20px;}
.ri {text-align:right;border-bottom:1px black solid;border-left:1px black solid;}
.bo {border-bottom:1px black solid;border-left:1px black solid;}
.bc {border-bottom:1px black solid;border-left:1px black solid;text-align:center;}
.bs {border-left:1px black solid;}