.button-cover, .knobs, .layer
{
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.button
{
  position: relative;
  top: 50%;
  width: 74px;
  height: 36px;
  //margin: -20px auto 0 auto;
  overflow: hidden;
}
.button.r, .button.r .layer
{
  border-radius: 100px;
}

.checkbox
{
  position: relative;
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
  z-index: 3;
}

.knobs
{
  z-index: 2;
}

.layer
{
  width: 100%;
  background-color: #fcebeb;
  transition: 0.3s ease all;
  z-index: 1;
}

/* Button 1 */
#button-1 .knobs:before
{
  content: 'NO';
  position: absolute;
  top: 5px;
  left: 4px;
  width: 25px;
  height: 25px;
  color: #fff;
  font-size: 10px;
  font-weight: bold;
  text-align: center;
  line-height: 1;
  padding: 7px 4px;
  //background-color: #03A9F4;
  background-color: #f44336;
  border-radius: 50%;
  transition: 0.3s cubic-bezier(0.18, 0.89, 0.35, 1.15) all;
}

#button-1 .checkbox:checked + .knobs:before
{
  content: 'YES';
  left: 44px;
  //background-color: #f44336;
  background-color: #03A9F4;
}

#button-1 .checkbox:checked ~ .layer
{
  background-color:#ebf7fc;
}

#button-1 .knobs, #button-1 .knobs:before, #button-1 .layer
{
  transition: 0.3s ease all;
}