body {
    background-color: #111;
    background: url('../bg.jpg') no-repeat, center, center, fixed;
    background-size:auto;
    background-position-x:center;
    color: #eee;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    padding: 2rem;
}
h1, h2 {
    color: #f00;
    text-shadow: 2px 2px #000;
}
header {
    text-align: center;
    border-bottom: 3px solid #444;
    margin-bottom: 2rem;
}
nav a {
    color: #ccc;
    text-decoration: none;
    margin: 0 1rem;
}
nav a:hover {
    color: #fff;
    text-decoration: underline;
}
button {
    background: #444;
    color: #fff;
    padding: 0.5rem 1rem;
    border: none;
    margin-top: 1rem;
    font-size: 1.1rem;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}
textarea, input[type=text], input[type=password] {
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.5rem;
    background: #222;
    color: #fff;
    border: 1px solid #555;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}
form {
    max-width: 600px;
    margin: 0 auto;
}
footer {
    text-align: center;
    margin-top: 4rem;
    font-size: 0.8rem;
    color: #777;
}
a {
    color: #f00;
}
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8); /* 60% transparentes Schwarz */
    z-index: 0;
}

main, header, footer {
    position: relative;
    z-index: 1;
}

.question-text {
    background: rgba(0,0,0,0.5);
    color: #fff;
    text-align: center;
    font-size: 1.5rem;
    margin: 2rem 0;
    line-height: 1.6;
    word-wrap: break-word;
}