tr:nth-child(even) { background: rgba(0,0,0, 0.2); }
tr:hover { background: rgba(0,0,255, 0.3); }
td { border-top: 1px solid #000; }
.fail { background: #f00; }
.fail:nth-child(even) { background: #f06; }
.fail:hover { background: #f80; }