how to make only one switch button enabled

Question

I have three switch buttons in my form and I want that user can switch on one button and others became automatically off. I do not want to use typical radio button in my form. I get switch button from : http://www.w3schools.com/howto/howto_css_switch.asp

my html is :

<!-- Rectangular switch -->
<label class="switch">
  <input type="checkbox">
  <div class="slider"></div>
</label>

<!-- Rounded switch -->
<label class="switch">
  <input type="checkbox">
  <div class="slider round"></div>
</label>

and my css is :

<style type="text/css">
/* The switch - the box around the slider */
.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

/* Hide default HTML checkbox */
.switch input {display:none;}

/* The slider */
.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  -webkit-transition: .4s;
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  -webkit-transition: .4s;
  transition: .4s;
}

input:checked + .slider {
  background-color: #2196F3;
}

input:focus + .slider {
  box-shadow: 0 0 1px #2196F3;
}

input:checked + .slider:before {
  -webkit-transform: translateX(26px);
  -ms-transform: translateX(26px);
  transform: translateX(26px);
}

/* Rounded sliders */
.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}
</style>

Also I want to switch on "Buy" default button

Answer 1

Use radio instead of checkbox and add "checked" for default option

<!-- Rectangular switch -->
<label class="switch">
  <input type="radio" name="switch" checked>
  <div class="slider"></div>
</label>

<!-- Rounded switch -->
<label class="switch">
  <input type="radio" name="switch">
  <div class="slider round"></div>
</label>

https://jsfiddle.net/tu25Lr8t/