.wrapper {max-width:60%;}

.logo {width:45%;}
.logo img {min-width:250px;width:90%;height:auto;margin:5% 0 3% 5%;}

.suche input.lupe {width:35px;height:35px;}
.startseite input.lupe {top: 10px;}

.wrapper_welle:after {content: url("media/welle.png");}