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HTML 

              
                <div class="container">
  <br/>
  <h1>Bootstrap Select - diablo3 style</h1><br/>
  <div class="row">
    <div class="col-md-6">
      <h3>Single select // character selection :</h3>
      <select class="d3-select form-control" id="character-selection" data-live-search="false">
          <option value="barbarian" data-content="<img class='img-flag' src='https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/barbarianmale.png'>Barbarian">Barbarian</option>
          <option value="crusader" data-content="<img class='img-flag' src='https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/crusadermale.png'>Crusader">Crusader</option>
        <option value="demon-hunter" data-content="<img class='img-flag' src='https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/demon-huntermale.png'>Demon Hunter">Demon Hunter</option>                  <option data-content="<img class='img-flag' src='https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/monkmale.png'>Monk" value="Monk" >Monk</option>
       <option value="necromancer" data-content="<img class='img-flag' src='https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/necromancermale.png'>Necromancer">Necromancer</option>
       <option value="witch-doctor" data-content="<img class='img-flag' src='https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/witch-doctormale.png'>Witch Doctor">Witch Doctor</option>
        <option value="wizard" data-content="<img class='img-flag' src='https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/wizardmale.png'>Wizard">Wizard</option>
      </select>
    </div>
  </div>
  <div class="row">
    <div class="col-md-6">
      <br/><br/>
      <h3>Multiple select // Conquest selection :</h3>
      <select class="d3-select form-control" title="Choose a conquest..." multiple data-selected-text-format="count > 1" data-count-selected-text= "{0} conquests selected" data-size="auto">
         <option data-content="<img class='img-flag' src='https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/wizardmale.png'>Race to the top" value="Race to the top">Race to the top</option>
         <option value="Living Dangerously">Living Dangerously</option>
         <option value="It's A Marathon...">It's A Marathon...</option>       
         <option value="Better Lucky Than Good">Better Lucky Than Good</option>
        <option value="Divinity">Divinity</option>
       <option value="Lionhearted" data-subtext="Hardcore">Lionhearted</option>
        <option value="Sprinter">Sprinter</option>
        <option value="Speed Racer">Speed Racer</option>
        <option value="Death Gets Got">Death Gets Got</option>
       <option value="Sprinter">Top Spot</option>
       <option value="Now You've Done It">Now You've Done It</option>
       <option value="Now You've Really Done It">Now You've Really Done It</option>
        <option value="The Thrill">The Thrill</option>
        <option value="Super Human">Super Human</option>
        <option value="On a good day">On a good day</option>
        <option value="I can't stop">I can't stop</option>
         <option value="Avarice">Avarice</option>
       <option value="Avaritia">Avaritia</option>                             
      </select>
    </div>
  </div>
</div>
!

CSS 

              
                /*
Make bootstrap-select work with bootstrap 4 see:
https://github.com/silviomoreto/bootstrap-select/issues/1135
*/

:focus{
  outline:none;
}

.bootstrap-select .dropdown-toggle:focus{
  outline:none !important;
  box-shadow:none;
}

.dropdown-toggle.btn-default {
  color: #292b2c;
  background-color: #fff;
  border-color: #ccc;
}
.bootstrap-select.show > .dropdown-menu > .dropdown-menu {
  display: block;
  height:100%;
}
.bootstrap-select > .dropdown-menu > .dropdown-menu li.hidden {
  display: none;
}
.bootstrap-select > .dropdown-menu > .dropdown-menu li a {
  display: block;
  width: 100%;
  padding: 3px 1.5rem;
  clear: both;
  font-weight: 400;
  color: #292b2c;
  text-align: inherit;
  white-space: nowrap;
  background: 0 0;
  border: 0;
  text-decoration: none;
}
.bootstrap-select > .dropdown-menu > .dropdown-menu li a:hover {
  background-color: #f4f4f4;
}
.bootstrap-select > .dropdown-toggle {
  width: 100%;
}
.dropdown-menu > li.active > a {
  color: #fff !important;
  background-color: #337ab7 !important;
}
.bootstrap-select .check-mark {
  line-height: 14px;
}


.bootstrap-select .check-mark::after {
  font-family: "FontAwesome";
  content: "\f00c";
}
.bootstrap-select button {
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Make filled out selects be the same size as empty selects */
.bootstrap-select.btn-group .dropdown-toggle .filter-option {
  display: inline !important;
}

/*customized*/

 .img-flag {
    height: 26px;
    width: 26px;
   margin-top:-4px;
   margin-right:5px;
}

.bootstrap-select.btn-group > .dropdown-menu {
    width: calc(100% + 14px);
    margin-left: -7px;
    height:200px;
}

.bootstrap-select > .dropdown-menu > .dropdown-menu li.selected a{
    background-color:#810102;
    color:white;
}

.bootstrap-select > .dropdown-menu > .dropdown-menu li a:hover{
    background-color:#da7e01;
    color:white;
}

.bootstrap-select.btn-group.show-tick .dropdown-menu li.selected a span.check-mark{
  display:none;
}

.dropdown-menu, .bootstrap-select.form-control{
  border:none;
 padding-top: 0px;
  padding-bottom:0px;
  /*max-height:200px !important;*/
    border-radius: 0;
  font-weight:400;
        border-style: solid;
    border-width: 7px 7px 7px 7px;
    -moz-border-image: url(https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/scrolldown.png) 7 7 7 7 fill stretch repeat;
    -webkit-border-image: url(https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/scrolldown.png) 7 7 7 7 fill stretch repeat;
    -o-border-image: url(https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/scrolldown.png) 7 7 7 7 fill stretch repeat;
    border-image: url(https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/scrolldown.png) 7 7 7 7 fill stretch repeat;
    background:none;
}

.bootstrap-select > .dropdown-menu > .dropdown-menu li a{
    color:#b3a684;
}

.bootstrap-select > .dropdown-menu > .dropdown-menu li a{
  padding:6px;
  
}

.bootstrap-select.form-control{
  height:44px;
}

.bootstrap-select.form-control .btn{
  background:none;
  color:white;
  border:none;
  padding:3px;
  padding-right:25px;
  font-size:18px;
}

.bootstrap-select.btn-group .dropdown-toggle .bs-caret{
  position:absolute;
   top: 0;
    bottom: 0;
    right: 0;
    margin: auto;
    margin-right: -1px;
    width: 32px;
    height: 32px;
    background: url(https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/ScrolldownButton.png);
    background-position: left top;
}

.bootstrap-select.btn-group .dropdown-toggle:hover .bs-caret{
   background-position: left center;
}

.bootstrap-select.btn-group .dropdown-toggle:active .bs-caret{
   background-position: left bottom;
}

.bootstrap-select.show .dropdown-toggle .bs-caret{
   background-position: center top;
}

.bootstrap-select.show .dropdown-toggle:hover .bs-caret{
   background-position: center center;
}

.bootstrap-select.show .dropdown-toggle:active .bs-caret{
   background-position: center bottom;
}


/*scroll*/

.mCSB_inside>.mCSB_container{
        margin-right:38px;
    }

   .mCSB_inside>.mCSB_container{
    margin-right:34px;
   }

   .mCSB_scrollTools{
        width:33px;
        min-height:10px;
        opacity:1;
    }

     .mCSB_scrollTools .mCSB_buttonUp{
        background-image: url(https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/ScrollArrowBottom.png);
        width:33px;
        height:33px;
        left:0;
        right:0;
        margin:auto;
        background-position:right top !important;
        opacity:1;
    }


     .mCSB_scrollTools .mCSB_buttonDown{
        background-image: url(https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/ScrollArrowBottom.png);
        width:33px;
        height:33px;
        left:0;
        right:0;
        margin:auto;
        background-position:left top !important;
        opacity:1;
    }

   .mCSB_scrollTools .mCSB_buttonUp:hover{
        background-position:right -33px !important;
    }

    .mCSB_scrollTools .mCSB_buttonDown:hover{
        background-position:left -33px !important;
    }

    .mCSB_scrollTools .mCSB_buttonUp:active{
        background-position:right -66px !important;
    }

   .mCSB_scrollTools .mCSB_buttonDown:active{
        background-position:left -66px !important;
    }

     .mCSB_scrollTools a+.mCSB_draggerContainer{
        margin-top:35px;
        margin-bottom:33px;
    }

     .mCS-light-2.mCSB_scrollTools .mCSB_draggerRail{
        width:100%;
        background:url("https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/scrollbar-vertical.png");
    }

.mCS-light-2.mCSB_scrollTools .mCSB_dragger .mCSB_dragger_bar {
    width: 100%;
    background: url(https://raw.githubusercontent.com/cromartie1984/diablo3-project/master/ScrollButton.png);
    background-position: left top !important;
}
     .mCSB_scrollTools .mCSB_dragger{
        width:25px;
        height: 35px;
        left:0;
        right:0;
        margin:auto;
    }
!

JS 

              
                $('.d3-select').selectpicker();

$('.d3-select').on('shown.bs.select', function (e) {
  $(this).find('.dropdown-menu.inner').mCustomScrollbar({
            scrollButtons:{
                    enable:true,
                    scrollAmount : "auto",
                    scrollType: "stepless" 
                },
                keyboard:{ 
                    enable: true,
                    scrollAmount : "auto",
                    scrollType: "stepless" 
                },
                autoDraggerLength: false,
                autoHideScrollbar : false,
                autoExpandScrollbar : false,
                snapAmount : 5,
                alwaysShowScrollbar : 0 ,
                mouseWheel:{ 
                    disableOver: ["select","option","keygen","datalist","textarea"],
                    deltaFactor : "100"
                },
                theme : "light-2"
        });

});

$('.d3-select').on('hide.bs.select', function (e) {
       $(this).find('.dropdown-menu.inner').mCustomScrollbar('destroy');
});
!
999px

Console