#youpicdiv{
 position:fixed;
 top:40em;
 right:1em;
 z-index: 999;}

@media all and (min-width: 120px) and (max-width:468px){
#youpicimg{
width:100px;}
}
@media all and (min-width: 470px) and (max-width:1268px) {
#youpicimg{
width:170px;}
}
@media all and (min-width: 1269px) {
#youpicimg{
width:170px;}
}