body {
    margin: 0 auto;
    background-image: url("/App_pics/Zand.jpg");
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
    font-size: medium;
    z-index: 0;
}

.Centreren {
    text-align: center;
}

#Container1 {
    position: absolute;
    top: 5px;
    margin: 0px auto;
    left: 0;
    right: 0;
    padding-top: 10px;
    background-color: #FFFF66;
    width: 285px;
    height: 390px;
    text-align: center;
    border: 1px solid black;
    z-index: 1;
}

#Container2 {
    position: absolute;
    top: 405px;
    left: 0;
    right: 0;
    margin: 0px auto;
    padding: 2px;
    background-color: #FFFFCC;
    width: 281px;
    height: 185px;
    text-align: center;
    border: 1px solid black;
    z-index: 1;
}

#Container3 {
    position: absolute;
    top: 595px;
    left: 0;
    right: 0;
    margin: 0px auto;
    padding-left: 20px;
    padding-top: 20px;
    background-color: #FFFF66;
    width: 265px;
    height: 50px;
    text-align: center;
    border: 1px solid black;
    z-index: 1;
}