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HTML 

              
                <body>
  <!-- navigation -->
  <header>
    <section>
    </section>
  </header>
  <main>
    <section>
      <div class="grid-container">
        <!-- section titles -->
        <div> 
          Inventory
        </div> 
        <div>
          Actions
        </div> 
        <div> 
          Storage
        </div> 
        <!-- inventory -->
          <div class="item-container">
          
            <div class="item-cell" id="i1">
              <div class="item">
                <img src="https://i.imgur.com/Yyr1zED.png" alt="Deagle" />
                <div class="overlay">
                  Pistol
                </div>
              </div>
            </div>  
        
            <div class="item-cell" id="i2">
              <div class="item">
                <img src="https://i.imgur.com/62XOJRo.png" alt="Nightstick" />
                <div class="overlay">
                  Nightstick
                </div>
              </div>
            </div>
           
           <div class="item-cell" id="i3">
           </div>
              
            <div class="item-cell" id="i4">
              <div class="item">
               <img src="https://i.imgur.com/KyJHqZb.png" alt="Taser" />
               <div class="overlay">
                 Taser
               </div>
             </div>
            </div>
            
            <div class="item-cell" id="i5">
              <div class="item stackable">
                <img src="https://i.imgur.com/VDsFdmg.png" alt="Blue Waffle" />
                <div class="overlay">
                  Blue Waffle
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="i6">
              <div class="item stackable">
                <img src="https://i.imgur.com/Gr4OB7y.png" alt="Chicken Kiev" />
                <div class="overlay">
                  Chicken Kiev
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="i7">
              <div class="item stackable">
                <img src="https://i.imgur.com/cWLeZvY.png" alt="Burger" />
                <div class="overlay">
                  Cheeseburger
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="i8">
            </div>
            
            <div class="item-cell" id="i9">
              <div class="item stackable">
                <img src="https://i.imgur.com/HDFnGHm.png" alt="Soylent Green" />
                <div class="overlay">
                  Soylent Green
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="i10">
              <div class="item stackable">
                <img src="https://i.imgur.com/oxoNUXW.png" alt="Water" />
                <div class="overlay">
                  Water
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="i11">
              <div class="item stackable">
                <img src="https://i.imgur.com/sGpLkhA.png" alt="Chocolate Milk" />
                <div class="overlay">
                  Chocolate Milk
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="i12">
              <div class="item stackable">
                <img src="https://i.imgur.com/gxZwJwQ.png" alt="Fudge" />
                <div class="overlay">
                  Tactical Fudge
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="i13">
              
            </div>
            
            <div class="item-cell" id="i14">
              <div class="item stackable">
                <img src="https://i.imgur.com/HDFnGHm.png" alt="Soylent Green" />
                <div class="overlay">
                  Soylent Green
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="i15">
            </div>  
            
            <div class="item-cell" id="i16">
            </div>
            
            <div class="item-cell" id="i17">
            </div>
            
            <div class="item-cell" id="i18">
            </div>
            
            <div class="item-cell" id="i19">
              <div class="item stackable">
                <img src="https://i.imgur.com/uUHnIHF.png" alt="Coffee" />
                <div class="overlay">
                  Coffee
                </div>
              </div>
            </div>
            
            
            <div class="item-cell" id="i20">
            </div>
            
            <div class="item-cell" id="i21">
              <div class="item stackable">
                <img src="https://i.imgur.com/HDFnGHm.png" alt="Soylent Green" />
                <div class="overlay">
                  Soylent Green
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="i22">
            </div>
            
            <div class="item-cell" id="i23">
            </div>
            
            <div class="item-cell" id="i24">
            </div>
            
          </div>
        <!-- actions -->
        <div class="action-container">
          <button>Search</button>
          <!-- multiplier -->
          <div class="multiplier">
	          <input id="down" type="button" value="-" onclick="down('1');" />
	          <input type="text" id="num" value="1"/>
	          <input id="up" type="button" value="+" onclick="up('');" />
          </div>
          <!-- use -->
          <button>Use</button>
          <!-- give -->
          <button>Give</button>
        </div>
        <!-- storage -->
          <div class="item-container">
            
            <div class="item-cell" id="s1">
              <div class="item">
                <img src="https://i.imgur.com/A6GYYlb.png" alt="Jerrycan" />
                <div class="overlay">
                  Jerrycan
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="s2">
            </div>
            
            <div class="item-cell" id="s3">
            </div>
            
            <div class="item-cell" id="s4">
              <div class="item">
                <img src="https://i.imgur.com/dEUIjGB.png" alt="Switchblade" />
                <div class="overlay">
                  Switchblade
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="s5">
            </div>
            
            <div class="item-cell" id="s6">
            </div>  
            
            <div class="item-cell" id="s7">
              <div class="item stackable">
                <img src="https://i.imgur.com/VDsFdmg.png" alt="Blue Waffle" />
                <div class="overlay">
                  Blue Waffle
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="s8">
            </div>
            
            <div class="item-cell" id="s9">
            </div>
            
            <div class="item-cell" id="s10">
              <div class="item stackable">
                <img src="https://i.imgur.com/emZzpja.png" alt="Pingaz" />
                <div class="overlay">
                  Happy Pills
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="s11">
              <div class="item stackable">
                <img src="https://i.imgur.com/uUHnIHF.png" alt="Coffee" />
                <div class="overlay">
                  Coffee
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="s12">
            </div>
            
            <div class="item-cell" id="s13">
            </div>
            
            <div class="item-cell" id="s14">
              <div class="item stackable">
                <img src="https://i.imgur.com/HDFnGHm.png" alt="Soylent Green" />
                <div class="overlay">
                  Soylent Green
                </div>
              </div>
            </div>
            
            <div class="item-cell" id="s15">
            </div>
            
            <div class="item-cell" id="s16">
            </div>
            
            <div class="item-cell" id="s17">
            </div>
            
            <div class="item-cell" id="s18">
            </div>
            
            <div class="item-cell" id="s19">
            </div>
            
            <div class="item-cell" id="s20">
            </div>
            
            <div class="item-cell" id="s21">
            </div>
            
            <div class="item-cell" id="s22">
            </div>
            
            <div class="item-cell" id="s23">
            </div>
            
            <div class="item-cell" id="s24">
            </div>

          </div>
      </div>
    </section>
    
    <!-- hotbar section -->
    <section>
      <div class="hotbar-grid-container">
        <div class="hotbar-item-container">
          <div class="hotbar-item-cell" id="h1">
            
            <div class="item">
               <img src="https://i.imgur.com/KyJHqZb.png" alt="Taser" />
               <div class="overlay">
                 Taser
               </div>
             </div>
            </div>
            <div class="hotbar-item-cell" id="h2">
            </div>
            <div class="hotbar-item-cell" id="h3">
            </div>
            <div class="hotbar-item-cell" id="h4">
            </div>
            <div class="hotbar-item-cell" id="h5">
            </div>
            <div class="hotbar-item-cell" id="h6">
            </div>
            <div class="hotbar-item-cell" id="h7">
            </div>
            <div class="hotbar-item-cell" id="h8">
            </div>
            <div class="hotbar-item-cell" id="h9">
            </div>
            <div class="hotbar-item-cell" id="h0">
            </div>
        </div>
      </div>
    </section>
  </main>
</body>
!

CSS 

              
                /*  color variables */
$black: #000000;
$white: #ffffff;
$dark: #111111;
$mgrey: #999999;
$lgrey: #cccccc;
$opacity: 0.6;

/* whole document */
body {
  background-image: url("https://i.imgur.com/EUsXMKW.png");
  background-repeat: no-repeat;
  background-color: $dark;
  font-family: Helvetica, sans-serif;
  color: $white;
  margin: 10%;
  /* makes text unselectable */
  -webkit-user-select: none; /* Safari */        
  -moz-user-select: none; /* Firefox */
  -ms-user-select: none; /* IE10+/Edge */
  user-select: none; /* Standard */
}

/* outer container */
.grid-container {
  display: grid;
  opacity: $opacity;
  grid-template-columns: 1fr .3fr 1fr;
  background: $black;
  padding: 1% 1% 1.5% 1%;
  grid-gap: 1%;
  text-align: center;
  max-height: 30em;
}

/* inventory/storage middle layer container */
.item-container {
  display: grid;
  overflow: scroll;
  overflow-x: hidden;
  background-color: $dark;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: auto;
  max-height: 25em;
}

/* individual inventory items */
.item-cell {
  border-style: solid;
  border-width: .1em;
  height: 6em;
}

/* text boxes underneath items */
.overlay {
margin: 1em;
}

/* photo images in inventory/storage */
.item-cell img {
  height: 2.5em;
  cursor: move;
  padding: 1em .8em 0em .8em;
}

/* makes cells change colour on hover */
.item-cell:hover {
  background-color: yellow;
  color: $black;
}

/* actions middle layer container */
.action-container {
  display: grid;
  padding: 4% 4% 4% 4%;
  grid-gap: 2%;
  background-color: $dark;
  max-height: 28em;
}

/* multiplier container */
.multiplier {
  display: grid;
  padding: 2% 2% 4% 2%;
  grid-template-columns: repeat(3, 1fr);
}

/* multiplier + and - buttons */
#down, #up {
  width: 1em;
  font-size: 2em;
}

/* all input fields */
input {
  width: 3.7em;
  text-align: center;
  font-size: 1.5em;
	border: 1px solid $lgrey;
}

/* outer container */
.hotbar-grid-container {
  margin-top: 50px;
  display: grid;
  opacity: $opacity;
  background: $black;
  padding: 1% 1% 1% 1%;
  grid-gap: 1%;
  text-align: center;
  max-height: 30em;
}

/* inventory/storage middle layer container */
.hotbar-item-container {
  display: grid;
  padding: .5em;
  grid-gap: .5em;
  background-color: $dark;
  grid-template-columns: repeat(10, 1fr);
  grid-template-rows: auto;
  max-height: 25em;
}

/* individual inventory items */
.hotbar-item-cell {
  background-color: $lgrey;
  height: 6em;
}

/* photo images in inventory/storage */
.hotbar-item-cell img {
  height: 2.5em;
  cursor: move;
  padding: 1em .8em 0em .8em;
}

/* numbers denoting which hotkey is attached */
.hotkey-overlay {
  display: grid;
  position: absolute;
  top: 0; 
  left: 0;
  background: rgba($white, $opacity);
  color: $black;
  padding: 6%;
}
!

JS 

              
                //makes the + button do addition
function up(max) {
    document.getElementById("num").value = parseInt(document.getElementById("num").value) + 1;   
}
//makes the - button do subtraction
function down(min) {
  document.getElementById("num").value = parseInt(document.getElementById("num").value) - 1;
  //stops it going below 1
    if (document.getElementById("num").value <= parseInt(min)) {
        document.getElementById("num").value = min;
    }
}
//hide the overlay class
//$(".overlay").hide();





// https://stackoverflow.com/questions/26759529/jquery-ui-dropdrag-inventory-with-stackable-items



//inventory draggability
//what you see being dragged
$(function() {
  function createHelper() {
          return $("<div />", {
            css: {
              border: "2px solid #444",
              background:"yellow",
              height: 75,
              width: 75
            }
          });
        }
  
	var item_isStackable = "";
	$( ".item").draggable({
    scroll: true,
		revert: function(isValidEl){
      //conditions under which it's not draggable
			if(isValidEl) {
				return false;
			}else{
				return true;
			}
		},
		helper: createHelper,
    start: function(){
      $(this).effect("highlight", {}, 1000);
    },
		drag: function(event, ui){
			item_isStackable = $(this).hasClass("stackable");
      //adds to var item_isStackable if it has the class of stackable
		},
	});
//inventory droppability
	$( ".item-cell" ).droppable({
		accept: ".item",
    //item-cell will only accept .item
		drop: function( event, ui ) {
      //large drop function
			var item = $(this).find(".item"); 
			if(item.length == 0) {
				console.log("Inserting");
				ui.draggable.detach().appendTo($(this)); 
        //if inv slot is empty insert item
			}
			else if($(this).context.innerHTML.includes(ui.draggable.context.innerHTML) == true && item_isStackable == true && item.hasClass("stackable") && ui.draggable.filter(function() {var d = this; return item.filter(function() { return d == this;}).length > 0; }).length === 0){
      //1st check if droppable and stackable are identical items
      //2nd check if both clone AND original are stackable
      //3rd stop (droppable) clone stacking with original
					console.log("Combining Items"); 
					ui.draggable.detach(); 
          //if it worked destroy the (draggable) clone
			}else{
				console.log("Reverting Position");
				ui.draggable.animate(ui.draggable.data().origPosition,"slow"); 
        //if not dropped in a cell revert everything back
			}
		}
	});
});
!
999px

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