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HTML 

              
                    <a href="http://katheermizal.info/blog/?p=86" class="back-to-article">
        << Back To The Article</a>
            <a href="https://github.com/Katheer/Working-with-checkbox" class="github">Git Hub</a>
            <main>
                <h1>Style Checkbox - using CSS custom properties</h1>
                <section>
					<h2 hidden>Check boxes</h2>
                    <ul>
                        <li>
                            <input type="checkbox" id="checkbox-a" name="checkbox" />
                            <label for="checkbox-a">Checkbox 1</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-b" name="checkbox" />
                            <label for="checkbox-b">Checkbox 2</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-c" name="checkbox" />
                            <label for="checkbox-c">Checkbox 3</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-d" name="checkbox" />
                            <label for="checkbox-d">Checkbox 4</label>
                        </li>

                        <li>
                            <input type="checkbox" id="checkbox-e" name="checkbox" />
                            <label for="checkbox-e">Checkbox 5</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-f" name="checkbox" />
                            <label for="checkbox-f">Checkbox 6</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-g" name="checkbox" />
                            <label for="checkbox-g">Checkbox 7</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-h" name="checkbox" />
                            <label for="checkbox-h">Checkbox 8</label>
                        </li>

                        <li>
                            <input type="checkbox" id="checkbox-i" name="checkbox" />
                            <label for="checkbox-i">Checkbox 9</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-j" name="checkbox" />
                            <label for="checkbox-j">Checkbox 10</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-k" name="checkbox" />
                            <label for="checkbox-k">Checkbox 11</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-l" name="checkbox" />
                            <label for="checkbox-l">Checkbox 12</label>
                        </li>

                        <li>
                            <input type="checkbox" id="checkbox-m" name="checkbox" />
                            <label for="checkbox-m">Checkbox 13</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-n" name="checkbox" />
                            <label for="checkbox-n">Checkbox 14</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-o" name="checkbox" />
                            <label for="checkbox-o">Checkbox 15</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-p" name="checkbox" />
                            <label for="checkbox-p">&nbsp;</label>
                        </li>

                        <li>
                            <input type="checkbox" id="checkbox-q" name="checkbox" />
                            <label for="checkbox-q">Checkbox 17</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-r" name="checkbox" />
                            <label for="checkbox-r">Checkbox 18</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-s" name="checkbox" />
                            <label for="checkbox-s">Checkbox 19</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-t" name="checkbox" />
                            <label for="checkbox-t">Checkbox 20</label>
                        </li>

                        <li>
                            <input type="checkbox" id="checkbox-u" name="checkbox" />
                            <label for="checkbox-u">Checkbox 21</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-v" name="checkbox" value="yes"/>
                            <label for="checkbox-v" data-input-value="Yes">&nbsp;</label>
                        </li>
                        <li>
                            <input type="checkbox" id="checkbox-w" name="checkbox" value="No"/>
                            <label for="checkbox-w" data-input-value="No">&nbsp;</label>
                        </li> 
                        <li> 
                            <input type="checkbox" id="checkbox-x" name="checkbox" />
                            <label for="checkbox-x">Checkbox 24</label>
                        </li>						
                    </ul> 
                </section>
            </main>
!

CSS 

              
                @import "compass";

////////////////////
/// Typhography ///
//
// Font Family
$font-family: Montserrat;
//
// Font Weights
$fw-300: 300;
$fw-400: 400;
$fw-500: 500;
$fw-600: 600;
//
// Font Size
$fs-small: 12px;
$fs-medium: 14px;
$fs-default: 16px;
$fs-large: 18px;
$fs-extra-large: 24px;
//
////////////////////
///    colors   /// 
//
// Base Colors
$white: #fff;
$black: #000;
$gray: #333;
$puple: #b95ed5;
$pink: #f79494;
//
// Text Colors
$font-white: $white;
$font-black: $black;
$font-gray: $gray;
$font-puple: $puple;
$font-pink: $pink;
//
// Background Colors
$background-white: $white;
$background-black: $black;
$background-gray: $gray;
$background-puple: $puple;
$background-pink: $pink; 
//
// Border Colors
$border-white: $white;
$border-black: $black;
$border-gray: $gray;
$border-pink: $pink;

// Create mixin for font-weight and font-size properties
@mixin custom-font($fontsize, $fontweight) {
    font-weight: $fontweight;
    font-size: $fontsize;
}

// Create mixin for transition property
@mixin transition($time, $type, $property) {
    transition: $time $type $property;
    -moz-transition: $time $type $property;
    -webkit-transition: $time $type $property;
}

// Create mixin for transition property with transition dela
@mixin transition-with-delay($tim, $dela, $typ, $propert) {
    transition: $tim $dela $typ $propert;
    -moz-transition: $tim $dela $typ $propert;
    -webkit-transition: $tim $dela $typ $propert;
}

// Create mixin for border-radius property
@mixin border-radius($radius) {
    border-radius: $radius;
    -moz-border-radius: $radius;
    -webkit-border-radius: $radius;
}

// Create mixin for transition property
@mixin box-shadow($shadow) {
    box-shadow: $shadow;
    -moz-box-shadow: $shadow;
    -webkit-box-shadow: $shadow;
}

@import url('https://fonts.googleapis.com/css?family=Montserrat:100,100i,200,200i,300,300i,400,400i,500,500i,600,600i,700i,800,800i,900,900i');

/*======================
  Reset Default Styles 
========================*/

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

body {
    font-family: $font-family, sans-serif;
}

a,
h1,
h2,
img,
li,
p,
section,
ul,
{
    margin: 0;
    padding: 0;
    border: 0;
    font: inherit;
    vertical-align: baseline
}

section {
    display: block
}

ul {
    list-style: none
}

a {
    outline: 0 !important;
    text-decoration: none !important;
}


/*======================
 Common Style 
========================*/

body {
    background-color: $background-pink;
}

a.back-to-article {
    width: 100%;
    float: left;
    padding: 10px 0px;
    margin-bottom: 30px;
    background: $background-gray;
    color: $font-white;
    text-align: left;
    text-indent: 20px;
    font-size: $fs-small;
    text-transform: uppercase;
    text-decoration: none;
    &.back-to-article:hover {
        color: $font-puple;
    }
}

a.github {
    width: 150px;
    right: -32px;
    top: 27px;
    position: fixed;
    padding: 5px 0 8px;
    color: $font-white;
    @include custom-font($fs-medium,
    $fw-500);
    background-color: $background-puple;
    text-transform: capitalize;
    text-align: center;
    transform: rotate(45deg);
    -webkit-transform: rotate(45deg);
    z-index: 111;
    @include box-shadow(1px 1px 1px 1px rgba(0, 0, 0, 0.5));
    &:hover {
        background-color: $background-white;
        color: $font-puple;
    }
}

main {
    width: 95%;
    max-width: 600px;
    margin: 0 auto;
    padding: 30px 0;
    h1 {
        color: $font-white;
        @include custom-font($fs-extra-large,
        $fw-600);
        text-align: center;
        text-transform: none;
    }
    h2 {
        padding: 15px 20px;
        color: $font-white;
        @include custom-font($fs-default,
        $fw-600);
        text-align: left;
        text-transform: uppercase;
        background: rgba(0, 0, 0, 0.5);
    }
    section {
        width: 100%;
        height: auto;
        float: left;
        display: block;
        margin: 0 auto;
        padding: 30px 0 0;
        li,
        a {
            display: block;
        }
        li {
            width: 12.25%;
            height: auto;
            float: left;
            position: relative;
            padding: 30px 0;
            &:nth-child(8n+1) {
                clear: left;
            }
        }
    }
}


/*---- View < 1024px ----*/

@media(max-width:1024px) {
    main section li {
        width: 50%;
        &:nth-child(4n+1) {
            clear: none;
        }
        &:nth-child(2n+1) {
            clear: left;
        }
    }
}


/*---- View < 450px ----*/

@media(max-width:450px) {
    main section li {
        width: 100%;
    }
}

/*======================
Check Boxes Styles
========================*/

input[type='checkbox'] {
    opacity: 0;
    z-index: -1;
}

input[type='checkbox']+label {
    width: 40px;
    height: 40px;
    display: block;
    position: relative;
    margin: auto;
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    text-indent: -999px;
    overflow: hidden;
    border: 1px solid $border-white;
    cursor: pointer;
}

/*-------------------
  #checkbox-a style
  ------------------*/

input[type='checkbox']#checkbox-a+label {
    border: 1px solid $border-white;
    background: transparent;
    @include transition(0.5s, ease, all);
}

input[type='checkbox']#checkbox-a:checked+label {
    border: 1px solid $border-white;
    background: $background-white;
}

/*-------------------
  #checkbox-b style
  ------------------*/

input[type='checkbox']#checkbox-b+label {
    border: 1px solid $border-white;
    background: transparent;
    @include transition(0.5s, ease, all);
}

input[type='checkbox']#checkbox-b:checked+label {
    border: 8px solid $border-white;
}

/*-------------------
  #checkbox-c style
  ------------------*/

input[type='checkbox']#checkbox-c+label {
    border: 1px solid $border-white;
    background-color: transparent;
    @include transition(0.8s, ease, border);
}

input[type='checkbox']#checkbox-c:checked+label {
    border: 8px solid $border-white;
    background: rgba(0, 0, 0, 0.5);
    @include transition(0.5s, ease, all);
}

/*-------------------
  #checkbox-d style
  ------------------*/

input[type='checkbox']#checkbox-d+label {
    border: 1px solid $border-white;
    background-color: transparent;
    @include transition(0.8s, ease, border);
}

input[type='checkbox']#checkbox-d:checked+label {
    border-left: 10px solid $border-white;
    border-right: 10px solid $border-white;
    background: rgba(0, 0, 0, 0.5);
    @include transition(0.5s, ease, all);
}

/*-------------------
  #checkbox-e style
  ------------------*/

input[type='checkbox']#checkbox-e+label {
    border: 1px solid $border-white;
    background-color: transparent;
    @include transition(0.8s, ease, border);
}

input[type='checkbox']#checkbox-e:checked+label {
    border-top: 10px solid $border-white;
    border-bottom: 10px solid $border-white;
    background: rgba(0, 0, 0, 0.5);
    @include transition(0.5s, ease, all);
}

/*-------------------
  #checkbox-f style
  ------------------*/

input[type='checkbox']#checkbox-f+label {
    border: 1px solid $border-white;
    background: transparent;
    @include transition(0.5s, ease, background);
    background-position: cennter;
    background-size: 40px 40px;
}

input[type='checkbox']#checkbox-f:checked+label {
    background: transparent url(http://katheermizal.info/works/working-with-checkbox/assets/images/tick-icon-white.png) no-repeat;
}

/*-------------------
  #checkbox-g style
  ------------------*/

input[type='checkbox']#checkbox-g+label {
    border: 1px solid $border-white;
    background: transparent url(http://katheermizal.info/works/working-with-checkbox/assets/images/tick-icon-transparent.png) no-repeat;
    background-position: center;
    background-size: 40px 40px;
    @include transition(0.4s, ease, background);
}

input[type='checkbox']#checkbox-g:checked+label {
    background: transparent url(http://katheermizal.info/works/working-with-checkbox/assets/images/tick-icon-white.png) no-repeat;
}

/*-------------------
  #checkbox-h style
  ------------------*/

input[type='checkbox']#checkbox-h+label {
    border: 1px solid $border-white;
    background: transparent url(http://katheermizal.info/works/working-with-checkbox/assets/images/tick-icon.png) no-repeat;
    background-position: 50% 0;
    background-size: 40px 80px;
    @include transition(0.4s, ease, background);
}

input[type='checkbox']#checkbox-h:checked+label {
    background-position: 50% -40px;
}

/*-------------------
  #checkbox-i style
  ------------------*/

input[type='checkbox']#checkbox-i+label {
    border: 1px solid $border-white;
    background: transparent;
}

input[type='checkbox']#checkbox-i+label:before {
    content: '';
    width: 5px;
    height: 5px;
    position: absolute;
    top: -60px;
    bottom: 0;
    left: -60px;
    right: 0;
    margin: auto;
    background-color: rgba(0, 0, 0, 0.5);
    @include transition(0.2s, ease, all);
}

input[type='checkbox']#checkbox-i:checked+label:before {
    width: 20px;
    height: 20px;
    top: 0;
    left: 0;
}

/*-------------------
  #checkbox-j style
  ------------------*/

input[type='checkbox']#checkbox-j+label {
    border: 1px solid $border-white;
    background: transparent;
}

input[type='checkbox']#checkbox-j+label:before,
input[type='checkbox']#checkbox-j+label:after {
    content: '';
    width: 10px;
    height: 20px;
    position: absolute;
    top: 0;
    bottom: 0;
    margin-top: auto;
    margin-bottom: auto;
    background-color: rgba(0, 0, 0, 0.5);
    @include transition(0.2s, ease, all);
}

input[type='checkbox']#checkbox-j+label:before {
    left: -22px;
}

input[type='checkbox']#checkbox-j+label:after {
    right: -22px;
}

input[type='checkbox']#checkbox-j:checked+label:before {
    left: 9px;
}

input[type='checkbox']#checkbox-j:checked+label:after {
    right: 9px;
}

/*-------------------
  #checkbox-k style
  ------------------*/

input[type='checkbox']#checkbox-k+label {
    border: 1px solid $border-white;
    background: transparent;
}

input[type='checkbox']#checkbox-k+label:before,
input[type='checkbox']#checkbox-k+label:after {
    content: '';
    width: 20px;
    height: 10px;
    position: absolute;
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;
    background-color: rgba(0, 0, 0, 0.5);
    @include transition(0.2s, ease, all);
}

input[type='checkbox']#checkbox-k+label:before {
    top: -22px;
}

input[type='checkbox']#checkbox-k+label:after {
    bottom: -22px;
}

input[type='checkbox']#checkbox-k:checked+label:before {
    top: 9px;
}

input[type='checkbox']#checkbox-k:checked+label:after {
    bottom: 9px;
}

/*-------------------
  #checkbox-l style
  ------------------*/

input[type='checkbox']#checkbox-l+label {
    border: 1px solid $border-white;
    background: $background-white;
}

input[type='checkbox']#checkbox-l+label:before,
input[type='checkbox']#checkbox-l+label:after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;
}

input[type='checkbox']#checkbox-l+label:before {
    width: 100%;
    height: 100%;
    background: $background-pink;
    @include transition(0.2s, ease, all);
}

input[type='checkbox']#checkbox-l+label:after {
    width: 0;
    height: 0;
    background: $background-white;
    @include transition(0.2s, ease, all);
    transition-delay: 0.2s;
    -webkit-transition-delay: 0.2s;
    -moz-transition-delay: 0.2s;
}

input[type='checkbox']#checkbox-l:checked+label:before {
    width: 25px;
    height: 25px;
}

input[type='checkbox']#checkbox-l:checked+label:after {
    width: 13px;
    height: 13px;
}

/*-------------------
  #checkbox-m style
  ------------------*/

input[type='checkbox']#checkbox-m+label {
    border: 1px solid $border-white;
    background: transparent;
}

input[type='checkbox']#checkbox-m+label:before {
    content: '';
    width: 20px;
    height: 20px;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    position: absolute;
    margin: auto;
    background-color: $background-white;
    opacity: 0;
    z-index: -1;
    @include transition(0.4s, ease-in-out, all);
}

input[type='checkbox']#checkbox-m:checked+label:before {
    opacity: 1;
    z-index: 1;
    transform: rotate(360deg);
    -webkit-transform: rotate(360deg);
}

/*-------------------
  #checkbox-n style
  ------------------*/

input[type='checkbox']#checkbox-n+label {
    border: 1px solid $border-white;
    background: transparent;
}

input[type='checkbox']#checkbox-n+label:before {
    content: '';
    width: 20px;
    height: 20px;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    position: absolute;
    margin: auto;
    background-color: rgba(0, 0, 0, 0.5);
    transform: scale(0);
    -webkit-transform: scale(0);
    transition: all 0.4s cubic-bezier(1, 0, 0.4, 0.5);
    -webkit-transition: all 0.4s cubic-bezier(1, 0, 0.4, 0.5);
}

input[type='checkbox']#checkbox-n:checked+label:before {
    transition: all 0.4s cubic-bezier(1, 0, 0.4, 1);
    -webkit-transition: all 0.4s cubic-bezier(1, 0, 0.4, 1);
    transform: scale(1);
    -webkit-transform: scale(1);
}

/*-------------------
  #checkbox-o style
  ------------------*/

input[type='checkbox']#checkbox-o+label {
    border: 1px solid $border-white;
    background: transparent;
}

input[type='checkbox']#checkbox-o+label:before {
    content: '';
    width: 25px;
    height: 25px;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    position: absolute;
    opacity: 0;
    z-index: -1;
    margin: auto;
    background: rgba(0, 0, 0, 0.5) url(http://katheermizal.info/works/working-with-checkbox/assets/images/tick-icon-white.png) no-repeat;
    background-position: center;
    background-size: 20px;
    @include transition(0.4s, ease, all);
}

input[type='checkbox']#checkbox-o:checked+label:before {
    opacity: 1;
    z-index: 1;
}

/*-------------------
  #checkbox-p style
  ------------------*/

input[type='checkbox']#checkbox-p+label {
    border: 1px solid $border-white;
    background: transparent;
    overflow: visible;
    @include transition(0.4s, ease, border);
}

input[type='checkbox']#checkbox-p+label:before {
    content: '';
    width: 15px;
    height: 15px;
    top: -54px;
    left: 0;
    bottom: 0;
    right: -54px;
    position: absolute;
    opacity: 0;
    z-index: -1;
    margin: auto;
    background: rgb(123, 74, 74) url(http://katheermizal.info/works/working-with-checkbox/assets/images/tick-icon-white.png) no-repeat;
    background-position: center;
    background-size: 13px;
    @include transition(0.4s, ease, all);
}

input[type='checkbox']#checkbox-p:checked+label {
    border: 8px solid $border-white;
}

input[type='checkbox']#checkbox-p:checked+label:before {
    opacity: 1;
    z-index: 1;
    top: -38px;
    left: 0;
    bottom: 0;
    right: -37px;
}

/*-------------------
  #checkbox-q style
  ------------------*/

input[type='checkbox']#checkbox-q+label {
    border: 1px solid $border-white;
    background: $background-white;
}

input[type='checkbox']#checkbox-q+label:before {
    content: '';
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    position: absolute;
    margin: auto;
    background: $background-pink;
    @include border-radius(0);
    @include transition(0.4s, ease, all);
}

input[type='checkbox']#checkbox-q:checked+label:before {
    width: 20px;
    height: 20px;
    @include border-radius(50%);
}

/*-------------------
  #checkbox-r style
  ------------------*/

input[type='checkbox']#checkbox-r+label {
    border: 1px solid $border-white;
}

input[type='checkbox']#checkbox-r+label:before,
input[type='checkbox']#checkbox-r+label:after {
    content: '';
    width: 10px;
    height: 10px;
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;
    opacity: 0;
    z-index: -1;
    @include transition(0.2s, ease, all);
}

input[type='checkbox']#checkbox-r+label:before {
    background: rgba(0, 0, 0, 0.5);
}

input[type='checkbox']#checkbox-r+label:after {
    background: $background-white;
    transition-delay: 0.3s;
    -webkit-transition-delay: 0.3s;
    -moz-transition-delay: 0.3s;
}

input[type='checkbox']#checkbox-r:checked+label:before {
    width: 26px;
    height: 26px;
    opacity: 1;
    z-index: 1;
    @include transition(0.2s, ease, all);
    transition-delay: 0.3s;
    -webkit-transition-delay: 0.3s;
    -moz-transition-delay: 0.3s;
}

input[type='checkbox']#checkbox-r:checked+label:after {
    opacity: 1;
    z-index: 1;
    @include transition(0.2s, ease, all);
}

/*-------------------
  #checkbox-s style
  ------------------*/

input[type='checkbox']#checkbox-s+label {
    border: 1px solid $border-white;
    background: tranparent;
    @include border-radius(10px);
}

input[type='checkbox']#checkbox-s+label:before {
    content: '';
    width: 20px;
    height: 20px;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    position: absolute;
    margin: auto;
    background: $background-pink;
    @include border-radius(2px);
    @include transition(0.4s, ease, all);
}

input[type='checkbox']#checkbox-s:checked+label:before {
    background: $background-white;
    @include border-radius(50%);
}

/*-------------------
  #checkbox-t style
  ------------------*/

input[type='checkbox']#checkbox-t+label {
    border: 1px solid $border-white;
    background: tranparent;
    @include border-radius(50%);
}

input[type='checkbox']#checkbox-t+label:before {
    content: '';
    width: 20px;
    height: 20px;
    top: 0;
    left: 0;
    bottom: -60px;
    right: 0;
    position: absolute;
    margin: auto;
    background: $background-white;
    @include border-radius(50%);
    @include transition(0.2s, ease, all);
}

input[type='checkbox']#checkbox-t:checked+label:before {
    bottom: 0;
}

/*-------------------
  #checkbox-u style
  ------------------*/

input[type='checkbox']#checkbox-u+label {
    border: 1px solid $border-white;
    background: transparent;
}

input[type='checkbox']#checkbox-u+label:before,
input[type='checkbox']#checkbox-u+label:after {
    content: '';
    width: 20px;
    height: 4px;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    position: absolute;
    margin: auto;
    background: transparent;
    @include transition(0.2s, ease, all);
}

input[type='checkbox']#checkbox-u:checked+label:before,
input[type='checkbox']#checkbox-u:checked+label:after {
    @include transition(0.4s, ease, all);
    background: $background-white;
}

input[type='checkbox']#checkbox-u:checked+label:before {
    transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg);
}

input[type='checkbox']#checkbox-u:checked+label:after {
    transform: rotate(45deg);
    -webkit-transform: rotate(45deg);
}

/*-------------------
  #checkbox-v style
  ------------------*/

input[type='checkbox']#checkbox-v+label {
    border: 1px solid $border-white;
    background: transparent;
    overflow: visible
}

input[type='checkbox']#checkbox-v+label:before,
input[type='checkbox']#checkbox-v+label:after {
    position: absolute;
    opacity: 0;
    z-index: -1;
    @include transition(0.5s, ease, all);
}

input[type='checkbox']#checkbox-v+label:before {
    content: '';
    width: 1px;
    left: 0;
    right: 0;
    bottom: calc(100% + 3px);
    margin: auto;
    border-left: 9px solid transparent;
    border-right: 9px solid transparent;
    border-top: 9px solid $border-white;
}

input[type='checkbox']#checkbox-v+label:after {
    content: attr(data-input-value);
    width: 100%;
    display: block;
    padding: 5px 0;
    @include border-radius(4px);
    background-color: $background-white;
    color: $font-pink;
    @include custom-font($fs-small, $fw-400);
    text-align: center;
    text-transform: none;
    bottom: calc(100% + 10px);
    text-indent: 0;
    overflow: hidden;
}

input[type='checkbox']#checkbox-v:checked+label {
    background: $background-white;
}

input[type='checkbox']#checkbox-v:checked+label:before,
input[type='checkbox']#checkbox-v:checked+label:after {
    opacity: 1;
    z-index: 11;
    @include transition(0.25s, ease, all);
}

/*-------------------
  #checkbox-w style
  ------------------*/

input[type='checkbox']#checkbox-w+label {
    border: 1px solid $border-white;
    background: transparent;
    overflow: visible
}

input[type='checkbox']#checkbox-w+label:before,
input[type='checkbox']#checkbox-w+label:after {
    position: absolute;
    opacity: 0;
    z-index: -1;
    @include transition(0.5s, ease, all);
}

input[type='checkbox']#checkbox-w+label:before {
    content: '';
    width: 1px;
    left: 0;
    right: 0;
    top: calc(100% + 3px);
    margin: auto;
    border-left: 9px solid transparent;
    border-right: 9px solid transparent;
    border-bottom: 9px solid $border-white;
}

input[type='checkbox']#checkbox-w+label:after {
    content: attr(data-input-value);
    width: 100%;
    display: block;
    padding: 5px 0;
    @include border-radius(4px);
    background-color: $background-white;
    color: $font-pink;
    @include custom-font($fs-small, $fw-400);
    text-align: center;
    text-transform: none;
    top: calc(100% + 10px);
    text-indent: 0;
    overflow: hidden;
}

input[type='checkbox']#checkbox-w:checked+label {
    background: $background-white;
}

input[type='checkbox']#checkbox-w:checked+label:before,
input[type='checkbox']#checkbox-w:checked+label:after {
    opacity: 1;
    z-index: 11;
    @include transition(0.25s, ease, all);
}

/*-------------------
  #checkbox-x style
  ------------------*/

input[type='checkbox']#checkbox-x+label {
    background: transparent;
    border-top: 5px solid $border-white;
    border-bottom: none;
    border-left: none;
    border-right: none;
}

input[type='checkbox']#checkbox-x+label:before,
input[type='checkbox']#checkbox-x+label:after {
    content: '';
    height: 5px;
    right: 0;
    position: absolute;
    background: $background-white;
    @include transition(0.2s, ease, all);
}

input[type='checkbox']#checkbox-x+label:before {
    top: 10px;
    width: 25px;
}

input[type='checkbox']#checkbox-x+label:after {
    top: 25px;
    width: 15px;
}

input[type='checkbox']#checkbox-x:checked+label {
    border-top: 0px solid transparent;
}

input[type='checkbox']#checkbox-x:checked+label:before,
input[type='checkbox']#checkbox-x:checked+label:after {
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    width: 30px;
    height: 5px;
}

input[type='checkbox']#checkbox-x:checked+label:before {
    transform: rotate(-315deg);
    -webkit-transform: rotate(-315deg);
}

input[type='checkbox']#checkbox-x:checked+label:after {
    transform: rotate(315deg);
    -webkit-transform: rotate(315deg);
}
!

JS
!
999px

Console