BODY {
    margin-left: 10%;
    margin-right: 10%;
    padding: 10px 10px 10px 10px;
    color: black;
    font-family: Verdana, Arial, sans-serif;
    font-size: medium;
    background-color: yellow;
}
#bmi {
    background-color:red;
    border: 4px;
    border-style: outset;
    padding: 20px;
}
#osm {
    background-color:green;
    border: 4px;
    border-style: outset;
    padding: 20px;
}
#fwd {
    background-color: blue;
    border: 4px;
    border-style: outset;
    padding: 20px;
}
a {
    color: white;
}