body {
    background-image: url("./hsmw_carl-georg-weitzel-bau_haus1_1700x1000.jpg");
    margin: 0;
    font-family: "Arial";
    background-size: cover;
}
section {
    position: absolute;

}
h1 {
    font-size: large;
}
button {
    font-size: 100%;
    padding: .4em 2em;
    border: thin solid black;
    border-radius: 0;
    box-shadow: 0;
    background: grey;
    color: white;
}
button.active {
    background: #2a6bb7
}
strong {
    color: #2a6bb7;
}
#content-box {
    box-sizing: border-box;
    top: 50%;
    left: 50%;
    margin-left: -15em;
    margin-top: -15em;
    background-color: white;
    padding: 3em;
    width: 30em;
    height: 30em;
    max-width: 40em;
}
#content-body {
    width: 30em;
    margin-top: 5em;
}
#content-footer {
    margin-top: 22em;
}
#shield {
    width: 100%;
    height: 100%;
    background-color: black;
    opacity:0.5;
    margin: 0;
}
#mail-input {
    font-size: 120%;
    width: 100%;
    border: none;
    border-bottom: 1px solid #000;
    outline: 0;
}
#mail-result {
    font-size: 70%;
}
#attention {
    font-size: 70%;
    color: red;
}