body{
    background-image: linear-gradient(to right, #27C648, #68D355);
}

#main-container {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    max-width: 100%;
    max-height: 100%;
}

#rubbel-container {
    position: relative;
    margin-left: auto;
    margin-right: auto;
}

#canvas {
    position: relative;
    z-index: 2;
    border: 1px solid black;
}

#image {
    position: absolute;
    z-index: 1;
    border: 1px solid black;
    max-width: 100%;
}

#progress {
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    border: 1px solid black;
    background-color: lightgrey;
}

#bar {
    width: 0%;
    height: 1.5em;
    background-color: #4CAF50;
    text-align: center;
    line-height: 1.5em;
    color: black;
}

footer {
    margin-top: 3em;
    text-align: center;
}

footer a {
    color: darkblue;
}