Pure CSS Shiny animated checkboxes

Instead of creating a directive or jquery plugin, creating a silky looking checkbox can simply be done using :checked + whatever {}

CSS

.switch{
    display: inline-block;
    line-height: 1;
}

.switch input {
    display: none;
}
.switch i {
    position: relative;
    display: inline-block;
    cursor: pointer;
    padding: .15em 1.5em .15em .15em;
    transition: all ease 0.2s;
    -webkit-transition: all ease 0.2s;
    border-radius: 1em;
    background-color: gray;
    overflow: hidden;
}
.switch i::before {
    display: block;
    content: '';
    width: 1em;
    height: 1em;
    border-radius: 1em;
    background: white;
}

.switch i::after {
  position: absolute;
  display: block;
  text-transform: uppercase;
  font-size: .5em;
  font-style: normal;
  top: 0;
  color: #fff;
  line-height: 1;
  content: 'off';
  left: 0;
  padding-left: 2em;
  width: 100%;
  box-sizing: border-box;
  text-align: center;
  height: 1em;
  bottom: 0;
  margin: auto;
}

.switch :checked + i::after {
  padding-left: 0;
  padding-right: 2em;
  content: 'on';
}

.switch :checked + i {
    padding-right: .15em;
    padding-left: 1.5em;
    background-color: green;
}

.switch.switch-red :checked + i {
    background-color: red;
}