body {
    background-color: White ;
    font-family: sans-serif ;
}
header h1 {
    text-align: center ;
    padding: 2% ;
    margin: 0 ;
    background-color: LightGreen ;
}
h1 {
    color: Green;
}
nav.buttons ul {
    margin: 0 ;
    text-align: center ;
    padding: 2% ;
    background-color: LightBlue ;
}
nav.buttons li {
    display: inline ;
    margin: 0 ;
    padding: 2% ;
    background-color: LightBlue ;
}
nav.buttons li a {
    color: DarkBlue ;
}
article {
    margin: 0 ;
}
table, td, th {
    border: 2px solid Green ;
    border-collapse: collapse ;
}
table.events {
    border: solid ;
}
table.events tr {
    border: solid ;
}
table.events td {
    border: solid ;
    border-style: ridge ;
    color: Green ;
}
td.number {
    text-align: right ;
    font-family: monospace ;
    font-size: large ;
}
td.center {
    text-align: center ;
}