#header{
  background-color:rgba($firm,.9);
  color:$contrast;
  height:70px;
  font-weight:700;
  .hd-wraper{
    line-height:70px;
  }
  .nav{
    @include mob-pic('back',$img-path);
    position:relative;
    top:23px;
  }
}
.index{
  #header .nav{
    @include mob-pic('logo',$img-path);
    top:0;
  }
}