body {
    font-family: "Trebuchet MS", "Lucida Grande", "Lucida Sans Unicode", "Lucida Sans", Tahoma, Arial, sans-serif;
    font-size: 1.1em;
}

#wrapper {
    margin: 0 auto;
    width: 1000px;
}

#header, #container, #footer {
    float: left;
    width: 100%;
}

#main-nav, #content {
    float:left;
}

#main-nav {
    width: 25%;
}

#content {
    width: 75%;
}

#logo {
    float: left;
    width: 25%;
}

#logo img, #content img {
    width : 100%;
}

#main-nav * {
    list-style: none;
    text-decoration: none;
    color: #000000;
    margin: 0;
    padding: 0;
}

/* Das Kontaktformular */ 
form#contact {
    background-color: #eee;
    width: 100%; /* Breite des Formulars */
    float: left;
    border: 1px solid #000000;
}
#contact label { /* Beschriftung auf eigener Zeile */
    margin-left: 5%;
    cursor: pointer; /* Mauszeiger wird zur Hand */
    display: block;
}

input#sender,
textarea#message {
    margin-left: 5%;
    width: 75%;
    border: 1px solid #000000;
    margin-bottom: 1em;
}

input#send {
    margin-left: 5%;
    margin-bottom: 1em;
}

textarea#message {
    height: 10em;
}
input:focus,
textarea:focus {
    background-color: #d9d9d9;
}

@media (max-width:1000px) {
    
    #wrapper {
        margin: 1% auto;
        width: 98%;
    }
}

@media (max-width:640px) {

    #main-nav, form#contact {
        width: 100%;
    }
    #main-nav li {
        float: left;
        padding-right: 1em;
    }

    #main-nav a {
        display: inline-block;
    }

    #content {
        padding-top: 25px;
        width: 100%;
    }
}