.container
  #app
    .tagHere
    <input type="text" autofocus/>

.note Use Tab to input a tag.

body {
  padding:0;
  margin:0;
  font-family: 'Raleway', sans-serif;
  background: #e9e9e9;
}

#app {
  padding: 20px;
  width: 600px;
  height: auto;
  background: #fff;
  border-radius: 4px;
  box-shadow: 0 40px 50px rgba(0,0,0,0.25);
  outline: none;
  font-size: 1em;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  position: absolute;
  
  & input {
    outline: none;
    width: auto;
    border: 0;
    float: left;
    padding: 8px;
    background: none;
  }
  
  &::before {
    content: '';
    display: table;
  }
  
  &::after {
    content: '';
    display: table;
    clear: both;
  }
}

.tag {
  border-radius: 3px;
  background: #b5aff9;
  float: left;
  margin: 3px;
  padding: 4px;
  font-size: 1em;
  vertical-align: middle;
  box-shadow: 0px 1px 4px #c6c6c6,
              0px 2px 17px #d1d1d1;
  
  & a {
    color: #000;
    padding-right: 10px;
    padding-left:5px;
    padding-top: 5px;
    padding-bottom: 5px;
    margin-right: 5px;
  }
  
  & span {
    padding-right: 10px;
    padding-left: 0px;
    padding-top: 5px;
    padding-bottom: 5px;
  }
}

.note {
  position: fixed;
  bottom: 10px;
  text-align: center;
  width: 100%;
}

$(document).ready(function(){
  var $input = $("#app input"),
      $appendHere = $(".tagHere"),
      oldKey = 0, newKey,
      TABKEY = 9;
  $input.focus();
  
  $input.keydown(function(e){
  
    if(e.keyCode == TABKEY) {
      if(e.preventDefault) {
        e.preventDefault();
        if($(this).val() == '' || $(this).val() == ' ') {
          return false;
        }
        addTag($(this));
      }
      return false;
    }
    
    if($(this).val() == '' && e.keyCode === 8) {
      $(".tag:last-child").remove();
    }
    
  })
  
  function addTag(element) {
    var $tag = $("<div />"), $a = $("<a href='#' />"), $span = $("<span />");
    $tag.addClass('tag');
    $('<i class="fa fa-times" aria-hidden="true"></i>').appendTo($a);
    $span.text($(element).val());
    $a.bind('click', function(){
      $(this).parent().remove();
      $(this).unbind('click');
    });
    $a.appendTo($tag);
    $span.appendTo($tag);
    $tag.appendTo($appendHere);
    $(element).val('');
  }
});