body {font-family:Cambria, Cochin, Georgia, Times, 'Times New Roman', serif}

div.container
{
    width:800px;
    margin:20px auto;
}
h1 {text-align: center;}

table, tr, td
{

    border: 1px solid #ccc;
    padding: 5px 10px;
    margin: none;
    border-collapse: collapse;
    
}

table.center {margin-left: auto; margin-right: auto;}

#demo {font-weight: bold; background-color: yellow;}
div.image {margin:20px 0;}