.display_mobile{display: none;}
.display_hd{display:none}

@media screen and ( max-width:48em){
  .display_mobile{display: inline-block;}
  #header{
  	background-color: rgb(79, 79, 79);
  }
}

@media screen and ( min-width:48em){
  .display_hd{display: inline-block;}
  #logo{
  	background-color: rgb(79, 79, 79);
  }
}