.demo
  .demo__title Checkboxes
  .demo__content
    label.switcher
      input(type="checkbox")
      .switcher__indicator
      span Normal
    br
    br
    label.switcher
      input(type="checkbox" checked)
      .switcher__indicator
      span Checked
    br
    br
    label.switcher
      input(type="checkbox" disabled)
      .switcher__indicator
      span Disabled
    br
    br
    label.switcher
      input(type="checkbox" disabled checked)
      .switcher__indicator
      span Disabled

@import url(https://fonts.googleapis.com/css?family=Raleway:400,300,700);

html {
  background: #29ce9a;
  font-family: Raleway;
  display: table;
  width: 100%;
  height: 100%;
}

body {
  display: table-cell;
  vertical-align: middle;
  text-align: center;
}

.demo {
  display: inline-block;
  padding: 50px;
  background-color: #fff;
  border-radius: 20px;
  color: #666;
  text-align: center;
}

.demo__content {
  text-align: left;
  display: inline-block;
}

.demo__title {
  font-size: 50px;
  font-weight: bold;
  text-transform: uppercase;
  padding-bottom: 30px;
}

.switcher {
  position: relative;
  display: inline-block;
  cursor: pointer;
  padding-left: 100px;
  height: 40px;
  line-height: 40px;
  margin: 5px;
  font-size: 30px;
  user-select: none;
  
  input {
    display: none;
  }
}

.switcher__indicator { 
  &::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 40px;
    width: 40px;
    background-color: #d5d5d5;
    border-radius: 50%;
    transition: all .3s ease;
    animation-name: pulsein;
    animation-duration: .3s;
  }
  
  &::before {
    content: '';
    position: absolute;
    top: 16px;
    left: 0;
    width: 80px;
    height: 8px;
    background-color: #d5d5d5;
    border-radius: 10px;
    transition: all .3s ease;
  }
  
  input:checked + &::after {
    background-color: #29ce9a;
    transform: translateX(40px);
    animation-name: pulseout;
    animation-duration: .3s;
  }
  
  input:checked + &::before {
    background-color: #29ce9a;
  }
  
  input:disabled + &::after,
  input:disabled + &::before {
    background-color: #e5e5e5;
  }
}

@keyframes pulsein {
  0%, 100% {
    top: 0px;
    height: 40px;
    width: 40px;
  }
  50% {
    top: 6px;
    height: 28px;
    width: 52px;
  }
}

@keyframes pulseout {
  0%, 100% {
    top: 0px;
    height: 40px;
    width: 40px;
  }
  50% {
    top: 6px;
    height: 28px;
    width: 52px;
  }
}