body{
    background-color: #ccc;
    margin: 0;
}

#wrapper{
    width: 1000px;
    margin: 0 auto;
    min-height: 500px;
    background-color: #e9e9e9;
    color: #333;
    padding: 10px;
    text-align: center;
}

body {
    margin: 0;
    background-color: #F0F0F0;
    font-family: 'Liberation Sans', Arial, sans-serif;
}

h1 {
    text-align: center;
}

#numbers {
    margin: 2em auto;
    padding: 0;
    width: 15em;
    height: 10em;
    overflow: auto;
    text-align: center;
    list-style-type: none;
}