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HTML 

              
                <div class="container">
  <ul class="ks-cboxtags">
    <li><input type="checkbox" id="checkboxOne" value="Rainbow Dash"><label for="checkboxOne">Rainbow Dash</label></li>
    <li><input type="checkbox" id="checkboxTwo" value="Cotton Candy" checked><label for="checkboxTwo">Cotton Candy</label></li>
    <li><input type="checkbox" id="checkboxThree" value="Rarity" checked><label for="checkboxThree">Rarity</label></li>
    <li><input type="checkbox" id="checkboxFour" value="Moondancer"><label for="checkboxFour">Moondancer</label></li>
    <li><input type="checkbox" id="checkboxFive" value="Surprise"><label for="checkboxFive">Surprise</label></li>
    <li><input type="checkbox" id="checkboxSix" value="Twilight Sparkle" checked><label for="checkboxSix">Twilight
                    Sparkle</label></li>
    <li><input type="checkbox" id="checkboxSeven" value="Fluttershy"><label for="checkboxSeven">Fluttershy</label></li>
    <li><input type="checkbox" id="checkboxEight" value="Derpy Hooves"><label for="checkboxEight">Derpy Hooves</label></li>
    <li><input type="checkbox" id="checkboxNine" value="Princess Celestia"><label for="checkboxNine">Princess
                    Celestia</label></li>
    <li><input type="checkbox" id="checkboxTen" value="Gusty"><label for="checkboxTen">Gusty</label></li>
    <li class="ks-selected"><input type="checkbox" id="checkboxEleven" value="Discord"><label for="checkboxEleven">Discord</label></li>
    <li><input type="checkbox" id="checkboxTwelve" value="Clover"><label for="checkboxTwelve">Clover</label></li>
    <li><input type="checkbox" id="checkboxThirteen" value="Baby Moondancer"><label for="checkboxThirteen">Baby
                    Moondancer</label></li>
    <li><input type="checkbox" id="checkboxFourteen" value="Medley"><label for="checkboxFourteen">Medley</label></li>
    <li><input type="checkbox" id="checkboxFifteen" value="Firefly"><label for="checkboxFifteen">Firefly</label></li>
  </ul>

</div>
!

CSS 

              
                body,
html {
    margin: 0;
    padding: 0;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background: #FFEFBA;
    /* fallback for old browsers */
    background: -webkit-linear-gradient(to right, #FFFFFF, #FFEFBA);
    /* Chrome 10-25, Safari 5.1-6 */
    background: linear-gradient(to right, #FFFFFF, #FFEFBA);
    /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */

}

.container {
    max-width: 640px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 13px;
}

ul.ks-cboxtags {
    list-style: none;
    padding: 20px;
}
ul.ks-cboxtags li{
  display: inline;
}
ul.ks-cboxtags li label{
    display: inline-block;
    background-color: rgba(255, 255, 255, .9);
    border: 2px solid rgba(139, 139, 139, .3);
    color: #adadad;
    border-radius: 25px;
    white-space: nowrap;
    margin: 3px 0px;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    transition: all .2s;
}

ul.ks-cboxtags li label {
    padding: 8px 12px;
    cursor: pointer;
}

ul.ks-cboxtags li label::before {
    display: inline-block;
    font-style: normal;
    font-variant: normal;
    text-rendering: auto;
    -webkit-font-smoothing: antialiased;
    font-family: "Font Awesome 5 Free";
    font-weight: 900;
    font-size: 12px;
    padding: 2px 6px 2px 2px;
    content: "\f067";
    transition: transform .3s ease-in-out;
}

ul.ks-cboxtags li input[type="checkbox"]:checked + label::before {
    content: "\f00c";
    transform: rotate(-360deg);
    transition: transform .3s ease-in-out;
}

ul.ks-cboxtags li input[type="checkbox"]:checked + label {
    border: 2px solid #1bdbf8;
    background-color: #12bbd4;
    color: #fff;
    transition: all .2s;
}

ul.ks-cboxtags li input[type="checkbox"] {
  display: absolute;
}
ul.ks-cboxtags li input[type="checkbox"] {
  position: absolute;
  opacity: 0;
}
ul.ks-cboxtags li input[type="checkbox"]:focus + label {
  border: 2px solid #e9a1ff;
}
!

JS
!
999px

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