body {
    background-image: url(background.png);
    background-size: 100% 100%;
}

.container {
    max-width: 500px;
    margin: auto;
    padding: 1px 20px;
    background-color: #FFFFFFD0;
    border-radius: 10px;
    font-size: large;
}

.background-source-container {
    position: absolute;
    right: 5px;
    bottom: 5px;
    padding: 1px 4.5px;
    background-color: #FFFFFF80;
    border-radius: 5px;
}

.background-source-container>a {
    font-size: small;
    color: black;
    text-decoration: none;
}