* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    min-height: 100%;
}

#wrapper {
    max-width: 531px;
    background: #FFF;
    border: 1px solid #231f20;
    font-family: 'Open Sans', sans-serif;
    font-size: 14px;
    line-height: 18px;
    text-align: justify;
    margin: 12px auto;
    padding: 0;
    overflow: hidden;
    position: relative;
    color: #231f20;
}

#anzeige_div {
    margin: 0;
    padding: 16px 16px 0 16px;
}

#header {
    margin: 0 0 16px;
    padding: 0;
}

#content {
    margin: 0;
    padding: 0;
}

#footer {
    margin: 12px 0 0;
    padding: 0;
}

h1 {
    font-size: 19px;
    margin: 4px 0 12px 0;
    line-height: 1.2;
    text-align: left;
}

h1 small {
    font-size: 81%;
    display: block;
    line-height: 23px;
}

h3 {
    font-size: 24px;
    margin: 16px 0;
    line-height: 28px;
}

p {
    margin-bottom: 12px;
}

p:last-child {
    margin-bottom: 0;
}

a {
    color: #231f20;
    text-decoration: none;
}

a:hover {
    text-decoration: none;
}

img {
    max-width: 100%;
}

.clearfix {
    clear: both;
    font-size: 0;
    line-height: 0;
    display: block;
}

br {
    display: block;
}

h1 span {
    font-size: 14px;
    display: block;
    font-weight: normal;
}

#content p span {
    text-align: center;
    display: block;
}

.center {
    text-align: center;
    margin-bottom: 0;
}

small {
    font-size: 15px;
}

.qr-code {
    position: absolute;
    top: 142px;
    right: 17px;
}

@media screen and (max-width: 531px) {
    #wrapper {
        border: none;
        margin: 0;
        text-align: left;
    }

    #anzeige_div {
        padding: 10px;
    }

    #anzeige_div br {
        display: none;
    }

    #header,
    #aside,
    #footer {
        position: relative;
        top: 0;
        left: 0;
    }

    #header {
        text-align: left;
    }

    a {
        white-space: nowrap;
    }

    #footer {
        text-align: left;
    }

    #aside {
        text-align: left;
    }

    #content {
        margin: 0;
        padding: 0;
    }

    h1 {
        margin: 10px 0 10px 0;
        font-size: 18px;
        line-height: 20px;
    }

    h3 {
        margin: 10px 0 10px 0;
        font-size: 14px;
        line-height: 20px;
    }

    p {
        margin-bottom: 3%;
    }

    a {
        font-weight: bold;
    }

    h1 br {
        display: block;
    }

    #footer br {
        display: block;
    }

    h1 span {
        font-size: 15px;
    }

    p {
        text-align: left;
    }

    .qr-code {
        position: static;
        display: flex;
        justify-content: center;
    }
}