JSFiddle - React, Tailwind, and code Playground

HTML

<link rel=”stylesheet” href=”https://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css”>

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>

<script src="https://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<div class="container">
    <div class="row">
	<div class="col-lg-12">
		
		<div class="checkbox checkbox-slider--b-flat">
			<label>
				<input type="checkbox"><span>Default</span>
			</label>
		</div>
		<div class="checkbox checkbox-slider--b-flat">
			<label>
				<input type="checkbox" checked=""><span>checked</span>
			</label>
		</div>
		<div class="checkbox checkbox-slider--b-flat">
			<label>
				<input type="checkbox" disabled=""><span>disabled</span>
			</label>
		</div>
		<div class="checkbox checkbox-slider--b-flat">
			<label>
				<input type="checkbox" disabled="" checked=""><span>disabled checked</span>
			</label>
		</div>
	</div>
	
</div>
</div>

CSS

.checkbox-slider--b-flat {
  position: relative;
  margin-bottom:10px
}
.checkbox-slider--b-flat input {
  display: block;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 0%;
  margin: 0 0;
  cursor: pointer;
  opacity: 0;
  filter: alpha(opacity=0);
}
.checkbox-slider--b-flat input + span {
  cursor: pointer;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
}
.checkbox-slider--b-flat input + span:before {
  position: absolute;
  left: 0px;
  display: inline-block;
}
.checkbox-slider--b-flat input + span > h4 {
  display: inline;
}
.checkbox-slider--b-flat input + span {
  padding-left: 50px;
}
.checkbox-slider--b-flat input + span:before {
  content: "";
  height: 24px;
  width: 40px;
  background: rgba(100, 100, 100, 0.2);
  box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.8);
  transition: background 0.2s ease-out;
}
.checkbox-slider--b-flat input + span:after {
  width: 20px;
  height: 20px;
  position: absolute;
  left: 0px;
  top: 0;
  display: block;
  background: #ffffff;
  transition: margin-left 0.1s ease-in-out;
  text-align: center;
  font-weight: bold;
  content: "";
}
.checkbox-slider--b-flat input:checked + span:after {
  margin-left: 20px;
  content: "";
}
.checkbox-slider--b-flat input:checked + span:before {
  transition: background 0.2s ease-in;
}
.checkbox-slider--b-flat input + span {
  padding-left: 50px;
}
.checkbox-slider--b-flat input + span:before {
  border-radius: 20px;
  width: 45px;
}
.checkbox-slider--b-flat input + span:after {
  background: #ffffff;
  content: "";
  width: 20px;
  border: solid transparent 2px;
  background-clip: padding-box;
  border-radius: 20px;
}
.checkbox-slider--b-flat input:not(:checked) + span:after {
  -webkit-animation: popOut ease-in 0.3s normal;
          animation: popOut ease-in 0.3s normal;
}

.checkbox-slider--b-flat input:checked + span:after {
  content: "";
  margin-left: 20px;
  border: solid...