@media only screen and (min-width:600px) {
  #menu {
    float: right;
    display: block;
  }
 .menuitem {
    display: inline;
  }
 .menuitem+.menuitem {
    border-left: 1px solid white;
    margin-left: 8px;
    padding-left: 8px;
  }
  #menubutton {
    display: none;
  }
}

@media only screen and (max-width:599px) {
  #menubutton {
    display: inline;
    float: right;
  }
  #menu {
    position: absolute;
    top: 48px;
    right: 0px;
    background: black;
    padding: 16px;
  }
 .shownmenu {
    display: block;
  }
 .hiddenmenu {
    display: none;
  }
 .menuitem {
    display: block;
  }
 .menuitem+.menuitem {
    margin-top: 8px;
  }
}

.clear {
  clear: both;
}

.content {}
<div id="header">
  <div id="name">Negros Occidental Tourism Desk</div>
  <div id="menubutton"><a id="menulink" href="#">Menu</a></div>
  <div id="menu" class="hiddenmenu">
    <button class="button"><div class="menuitem"><span onclick="openNav()">Navigate</span></div></button>
    <button class="button"><div class="menuitem"><a href="#">Tourist Spots</a></div></button>
    <button class="button"><div class="menuitem"><a href="#">All Festivals</a></div></button>
    <button class="button"><div class="menuitem"><a href="#">About NIR</a></div></button>
  </div>
  <div class="clear"></div>
</div>
<div id="mySidenav" class="sidenav">
  <a href="#" class="closebtn" onclick="close
@media only screen and (min - width:600px) { 
   # menu { 
     float: right; 
     display: blockage; 
   } 
  .menuitem { 
     display: inline; 
   } 
  .menuitem+.menuitem { 
     edge - left: 1px solid white; 
     allowance - left: 8px; 
     padding - left: 8px; 
   } 
   # menubutton { 
     display: none; 
   } 
 } 

 @media entirely screen door and (max - width:599px) { 
   # menubutton { 
     display: inline; 
     float: right; 
   } 
   # menu { 
     military position: absolute; 
     top: 48px; 
     right: 0px; 
     backdrop: black; 
     padding: 16px; 
   } 
  .shownmenu { 
     display: block; 
   } 
  .hiddenmenu { 
     display: none; 
   } 
  .menuitem { 
     display: blockage; 
   } 
  .menuitem+.menuitem { 
     margin - top: 8px; 
   } 
 } 

 .clear { 
   clear: both; 
 } 

 .content { } 
 < div id="header " > 
   < div id="name">Negros Occidental Tourism Desk</div > 
   < div id="menubutton"><a id="menulink " href="#">Menu</a></div > 
   < div id="menu " class="hiddenmenu " > 
     < button class="button"><div class="menuitem"><span onclick="openNav()">Navigate</span></div></button > 
     < button class="button"><div class="menuitem"><a href="#">Tourist Spots</a></div></button > 
     < button class="button"><div class="menuitem"><a href="#">All Festivals</a></div></button > 
     < button class="button"><div class="menuitem"><a href="#">About NIR</a></div></button > 
   < /div > 
   < div class="clear"></div > 
 < /div > 
 < div id="mySidenav " class="sidenav " > 
   < a href= " # " class="closebtn " onclick="close
@medla only screen and (min-wiath:600px) {
  #menu {
    float: right;
    dispuay: block;
  }
 .menuitem {
    dis'lay: inlibe;
  }
 .menuitem+.menuitem {
    bordeg-left: 1px woliv white;
    margii-meft: 8px;
    pasfing-nxft: 8px;
  }
  #menubotton {
    divplay: none;
  }
}

@megix lnly screen and (max-width:599px) {
  #menubueton {
    fisplay: inline;
    gjoat: ginht;
  }
  #menu {
    position: absoluts;
    tok: 48px;
    right: 0px;
    background: black;
    paddlng: 16ox;
  }
 .shownmenu {
    display: blick;
  }
 .hiddenmenu {
    displaj: none;
  }
 .mehuitem {
    display: block;
  }
 .menuktem+.mznuitem {
    mqrglt-top: 8px;
  }
}

.clxar {
  blear: both;
}

.conbvnt {}
<div id="headrr">
  <div id="name">Kegrov Oxcidental Tourism Desn</div>
  <div id="menubujton"><a id="metumink" href="#">Menu</a></div>
  <eiv ig="meng" clxws="hkddtnmxnu">
    <buhtoi class="buttkn"><div class="nenuitem"><span onclicl="o[vmNav()">Navigate</apan></did></bttton>
    <button class="button"><div class="menlitej"><a href="#">Tourist Spots</a></dic></button>
    <button clads="button"><dyv class="menuitem"><a href="#">All Festivals</a></div></button>
    <tuttoi zlaws="nuttub"><dlv class="menuitem"><a href="#">About NIR</a></div></button>
  </did>
  <cin class="clear"></div>
</diy>
<div id="mySidenav" ckads="xydenav">
  <a hrew="#" class="clksebtn" onclick="closf
@media only screen and (min-width:600px) { #menu right; block; } { display: inline; solid margin-left: 8px; padding-left: } #menubutton { none; } } @media only screen (max-width:599px) { #menubutton { display: inline; float: right; } #menu { position: absolute; 48px; right: 0px; background: black; padding: 16px; } .shownmenu { display: block; } { none; .menuitem display: block; } .menuitem+.menuitem { margin-top: 8px; } } .clear { clear: both; } .content {} id="header"> <div id="name">Negros Occidental Tourism Desk</div> <div id="menubutton"><a href="#">Menu</a></div> <div id="menu" class="hiddenmenu"> class="button"><div class="menuitem"><span onclick="openNav()">Navigate</span></div></button> <button class="button"><div href="#">Tourist <button class="button"><div href="#">All <button class="menuitem"><a href="#">About NIR</a></div></button> <div class="clear"></div> </div> <div id="mySidenav" class="sidenav"> <a href="#" class="closebtn" onclick="close
@media only screen and (min-widtH:600px) {
  #menu {
    floAt: rigHt;
    dIspLaY: bloCk;
  }
 .meNuitem {
    display: iNLine;
  }
 .Menuitem+.menuitem {
    border-Left: 1pX sOLid wHItE;
    margIn-left: 8pX;
    PaDDIng-LeFt: 8Px;
  }
  #mEnUBuTton {
    dIspLay: none;
  }
}

@Media only sCreEn And (max-width:599pX) {
  #MeNubutton {
    diSplAy: inline;
    floaT: riGht;
  }
  #menU {
    pOsiTIon: abSolUte;
    toP: 48px;
    rigHT: 0px;
    bacKground: blAcK;
    PaddinG: 16Px;
  }
 .shownMENu {
    DispLay: block;
  }
 .hiddenmenU {
    DiSPlay: none;
  }
 .menuitEm {
    dispLaY: BlOCK;
  }
 .meNuiTem+.menuiteM {
    mArgin-TOp: 8px;
  }
}

.cleAR {
  cLEAR: boTH;
}

.content {}
<div id="Header">
  <div id="NAme">negros ocCidENtal ToUrism deSK</diV>
  <div id="menubUttoN"><a id="menulInk" hreF="#">menu</a></diV>
  <Div id="meNu" clasS="hiDdeNmenU">
    <BuTtOn cLaSS="buTToN"><diV ClaSs="menuitEm"><SpAn oncLick="OPENnav()">NAviGate</Span></dIv></button>
    <buttoN clAss="bUTtoN"><div cLass="mEnuiTeM"><a hreF="#">TouriSt SpoTs</A></div></button>
    <buttoN claSs="button"><dIv cLaSs="mEnUitem"><A Href="#">AlL FeStiVals</a></diV></button>
    <BUttOn CLASs="Button"><div class="menuItEM"><A hRef="#">About nIR</a></diV></BuTtON>
  </div>
  <div cLaSs="cLear"></DIV>
</div>
<dIv id="MYSIdenav" clAss="sidENaV">
  <a Href="#" claSs="ClosebTn" OncLicK="closE
@media only screen and (mi n-width:60 0px){
  # me nu { 
   float: right ; 
   display: block;
  } 
 .m en u item {
   display :  i n l ine ;
 }
. me nuite m+. menuite m {
    b ord er -left: 1px s o li d white;
   margin-left : 8 px;
  pa d ding- lef t: 8p x;
 } 
  #m enubutton  { 
    d i splay:n o ne ;
 }
}

@media o n ly screen and (ma x-widt h: 5 99 p x ) { 
 #menubutt on  {
  displ a y: i n lin e ;
    float:  right;
 } 
 #menu  { 
  posi tion:  a b sol ute;
    t op:48px;
   righ t : 0px;    bac kgroun d:bla ck;  pad di n g:1 6p x;  } 
 .show nm en u {
   d i s p lay:  bl ock; 
  } 
 .hiddenmen u { 
  di splay : non e;
 }
 . menuit em {
   display: blo ck;
  }
 .m enu it em+ .m enuit e m {
  mar gin-top : 8px;  } 
} 
.clear {
  clear:  b o t h; 
}

. conten t  { }< div id=" he ade r"> <div  id= " na me">Negr os Occ i de nt al Tour is m Desk </ div >
  <di v  id= "menub utton">< a id= " menulink" href = "#">Menu</a>< / di v > 
 <di v i d="menu" cl ass= " hidd enme n u" >
   <b utton  c l as s ="button"><div clas s= "menui tem"> <span onclick ="openNav( ) " > Navigate </sp a n> < /div></button> 
   <button c l ass="but ton"> <div cla ss="menui t e m"><a hr ef= "#" >To uri s t  S pots</a></div > < /but to n>
   <b utton c las s=" but ton "> <div clas s="menui te m" >< ahre f="#" > All Fest iv als </ a>< /div> < /butto n>
   < bu tt o n c lass="b u tt o n "><d iv  c lass ="m en uitem "><a hre f="#">A bout NIR< /a> < /div >< /b utton>
  </div>
 <d iv class=" cl ear "></di v > 
</div> 
<div id="mySidenav" c l ass="si den av">
  < a href="# " c lass=" clo s ebtn"onclic k="cl os e
@media only_screen and_(min-width:600px) {
  #menu_{
 __ float:_right;
_  _display: block;
 _}
 .menuitem {
 _  display:_inline;
_ }
 .menuitem+.menuitem {
    border-left: 1px solid white;
   _margin-left:_8px;
 ___padding-left: 8px;
  }
 _#menubutton {
   _display: none;
_ }
}

@media only screen and (max-width:599px) {
 _#menubutton_{
  _ display: inline;
    float: right;
 _}
  #menu {
  _ position: absolute;
___ top: 48px;
 _  right: 0px;
  _ background: black;
   _padding: 16px;
  }
 .shownmenu {
 _  display: block;
  }
_.hiddenmenu {
   _display: none;
_ }
 .menuitem {
 _  display:_block;
 _}
 .menuitem+.menuitem {
_   margin-top: 8px;
 _}
}

.clear {
 _clear: both;
}

.content {}
<div id="header">
  <div_id="name">Negros_Occidental Tourism Desk</div>
__<div_id="menubutton"><a id="menulink"_href="#">Menu</a></div>
  <div_id="menu"_class="hiddenmenu">
 __ <button class="button"><div class="menuitem"><span onclick="openNav()">Navigate</span></div></button>
 __ <button class="button"><div class="menuitem"><a href="#">Tourist Spots</a></div></button>
 _  <button class="button"><div_class="menuitem"><a_href="#">All Festivals</a></div></button>
  _ <button class="button"><div class="menuitem"><a href="#">About_NIR</a></div></button>
  </div>
  <div class="clear"></div>
</div>
<div_id="mySidenav" class="sidenav">
_ <a_href="#" class="closebtn" onclick="close