.btnMenuOpen,
.btnMenuClose{
  display: none;
}

.menu_main li{
  display: inline-block;
}

/* RESPONSIVE */
@media screen and (max-width: 425px) {
  .menu_main{
    display: none;
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:100vh;
    z-index:2;
    background-color:#000000;
    padding-top:30px;
    margin-top:0;
  }
  .menu_main li{
    padding: 4px 15px;
    display: block;
  }
  .menu_main li a{
    color:#fff;
  }
  .menu_main > ul > li{
    border-bottom:1px solid #212121;
  }
  .btnMenuOpen{
    display: block;
    border:1px solid gray;
    position:absolute;
    right:10px;
    top:10px;
    padding:10px;
  }
  .btnMenuClose{
    position: fixed;
    top: 10px;
    right:15px;
    z-index:4;
    color: #fff;
    border: 1px solid #fff;
    padding: 10px;
  }
}