.windguru {
    border-collapse: collapse;
    font-family: sans-serif;
    font-size: 12px;
}

.windguru td, .windguru th {
    padding: 4px;
    text-align: center;
    min-width: 32px;
}

.windguru img {
    width: 16px;
}

.windguru tr:nth-child(2) td { /* viento */
    font-weight: bold;
    color: #000;
}