#myDIV, .header {
    background-color: #add8e6;
}
h1 {
    line-height: 40px;
}
input, td, th {
    font: 14px Verdana;
}
#myDIV, body {
    margin: 0;
    line-height: 30px;
}
#myDIV {
    width: 100%;
    height: 185px;
    padding: 10px;
    text-align: center;
}
button0, button1, button2, button3, button4 {
    display: inline-block;
}
body {
    background-color: #fff8dc;
    padding: 1px;
    font-size: 20px;
}
.button {
    margin: 5px;
    padding: 5px;
    font: 20px Arial;
}
.header {
    padding: 15px;
    position: sticky; top: 0;
}
.content {
    padding: 1px;
}