*
{
    margin: 0;
    padding: 0;
    font-family: monospace;
}

header, footer
{
    background-color: darkgreen;
    color: white;
    text-align: center;
    padding: 5px 0;
}

main
{
    width: 1200px;
    max-width: 100%;
    margin: 0 auto;
}

table
{
    margin: 10px auto;
    border-spacing: 0;
}

tr:nth-child(2n)
{
    background-color: rgb(213, 255, 213);
}

td 
{
    padding: 5px 10px;
}

a
{
    display: block;
    padding: 5px 10px;
    border-radius: 5px;
    background-color: darkgreen;
    color: white;
    text-decoration: none;
    min-width: 90px;
    text-align: center;
}