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

#wrapper {
    max-width: 468px;
    background: #fff;
    border: 4px solid #22af50;
    font-family: 'Roboto', sans-serif;
    font-size: 15px;
    line-height: 21px;
    margin: 16px auto;
    overflow: hidden;
    position: relative;
    color: #231f20;
}

#anzeige_div {
    padding: 12px 6px 6px;
}

#header {
    margin: 0 0 16px;
    text-align: center;
}

#footer {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 16px;
    flex-wrap: wrap;
}

#footer p {
    flex: 1 1 0;
}

h1 {
    font-size: 22px;
    margin: 5px -6px;
    line-height: 31px;
    background: #22af50;
    color: #fff;
    padding: 10px 6px;
}

p:not(:last-of-type) {
    margin-bottom: 16px;
}

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

img {
    max-width: 100%;
    vertical-align: top;
}

#content>span {
    display: block;
}

.text-center {
    text-align: center;
}

@media screen and (max-width: 468px) {
    #wrapper {
        border: none;
        margin: 0;
    }

    h1 {
        margin: 8px -16px;
        padding: 8px 16px;
    }

    p {
        text-align: center;
    }

    #anzeige_div {
        padding: 16px;
    }

    #footer {
        flex-direction: column;
        margin: 16px 0 0;
        align-items: center;
    }

    br {
        display: none;
    }
}