body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    text-align: center;
}

#header {
    margin-top: 20px;
}

#shape {
    width: 100px;
    height: 100px;
    background-color: red;
    position: absolute;
    display: none;
    cursor: pointer;
}