@media screen and (max-width: 900px) { 
    /* Breite beträgt höchstens 1024px */ 
*{
    /* background-color: yellow; */
}
#footer{
    position: relative;
}
#footer li:first-of-type{
    margin-left:0!important;
}
#footer li{
    line-height: 35px;
    text-align: center;
    display: block;
    float: none;
    width: 100%
}
.res_hidden{
    display: none!important;
}
#header{
    transition: 2s;
    position: relative;
    width: 100%;
    background-color: white;
    background-repeat: no-repeat;
    background-position: 50% 10px; 
}
#header a{
    width: 170%;
}
#nav{
    z-index: 100;
    position: relative;
    width: 100%;
    margin-top: 0px;
}
#nav li{
    float: none;
    display: block;
    width: 100%;
    margin-left: 1%;
    margin-right: 1%;
    /* border: 1px solid black; */
}
.res_show{
    display: block!important;
    margin:0;
}
#section{
    margin-top: 0px;
    margin-bottom: 40px;
    padding-bottom: 20px;
}
/* home */
.slider{
    margin-top: 10px;
}
/* Gästebuch */
#gbookl{
    margin-top: 20px;
    float: none;
    width: 90%;
    margin-left:3%;
}
#gbookr{
    margin-top: 20px;
    float: none;
    width: 90%;
    margin-left:3%;
}
/* IT-Service */
#card1, #card2{
    margin-left:5%;
    margin-bottom: 10px;
    float: none;
    width: 90%;
    height: auto;
}
/* Gallery */
.gallery_pic{
    display: inline-block;
    width:46%;
    height: auto;
    margin:2%;
}
#contact{
    margin: 10px;
}
#cleft{
    float: none;
    margin-left: 2%;
    width: 91%;
    height: 330px;
    /* padding:20px; */
}
#cright{
    float: none;
    margin-left: 2%;
    width: 91%;
    /* padding:20px; */
}
/* backend */
#backend{
    width: 91%;
    margin-left: 2%;
}
#respmenu{
    position: absolute;
    z-index: 3;
    top: -30px;
}
#respmenu{
    margin: 0;
    width:100%;
    display: block;
    background-color: white;
}
/* login */
#login{
float:none;
margin-left:2vw;
width: 91vw;
}
#register{
    float:none;
    margin-left:2vw;
    width: 91vw;
}
}