Something

body {
    font-family: Tahoma, Geneva, sans-serif;
    font-size:12px;
}
    table#schedule {
        border-collapse:collapse;
        border: 1px solid black;
        margin: 0 auto;
    }
        table#schedule th, table#schedule td {            
            border: 1px solid black;
            vertical-align: middle;
            text-align: center;
            width: 75px;
            height: 45px;
            padding: 0.7em;
        }