body {
    margin: 0;
    padding: 0;
    background-color: #000000;
    font-family: Arial; 
    color: #FFFFFF;
    font-size: 12px;
}
.a, a:hover {
    cursor: pointer;
}
p {
    text-align: justify;
}
h3 {
    color: #9900cc;
    font-size: 20px;
}
.canvas {
    width: 940px;
}
.canvas_header {
    height: 161px;
    text-align: center;
}
.canvas_wall
{
    background-image: url('../images/wall.png');
    background-position: center top;
    background-repeat: no-repeat;
    vertical-align: top;
}
.canvas_floor
{
    background-image: url('../images/floor.png');
    background-position: left bottom;
    background-repeat: no-repeat;
    vertical-align: top;
}