/* Add here all your CSS customizations */

/*.onoffswitch {
    position: relative; width: 40px;
    -webkit-user-select:none; -moz-user-select:none; -ms-user-select: none;
}
.onoffswitch-checkbox {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}
.onoffswitch-label {
    display: block; overflow: hidden; cursor: pointer;
    height: 15px; padding: 0; line-height: 15px;
    border: 0px solid #FFFFFF; border-radius: 20px;
    background-color: #E6E6E6;
}
.onoffswitch-label:before {
    content: "";
    display: block; width: 20px; margin: -2.5px;
    background: #38A22B;
    position: absolute; top: 0; bottom: 0;
    right: 21px;
    border-radius: 20px;
    box-shadow: 0 6px 12px 0px #757575;
}
.onoffswitch-checkbox:checked + .onoffswitch-label {
    background-color: #E6E6E6;
}
.onoffswitch-checkbox:checked + .onoffswitch-label, .onoffswitch-checkbox:checked + .onoffswitch-label:before {
   border-color: #E6E6E6;
}
.onoffswitch-checkbox:checked + .onoffswitch-label .onoffswitch-inner {
    margin-left: 0;
}
.onoffswitch-checkbox:checked + .onoffswitch-label:before {
    right: 0px; 
    background-color: #38A22B; 
    box-shadow: 3px 6px 18px 0px rgba(0, 0, 0, 0.2);
}
*/
<input type="checkbox" id="id-name--1" name="set-name" class="switch-input">
    <label for="id-name--1" class="switch-label"><span class="toggle--on">Addebito C/C</span><span class="toggle--off">Bollettino Postale</span></label>

.switch-input {
  display: none;
}
.switch-label {
  position: relative;
  display: inline-block;
  min-width: 112px;
  cursor: pointer;
  font-weight: 500;
  text-align: left;
  margin: 16px;
  padding: 16px 0 16px 44px;
}
.switch-label:before, .switch-label:after {
  content: "";
  position: absolute;
  margin: 0;
  outline: 0;
  top: 50%;
  -ms-transform: translate(0, -50%);
  -webkit-transform: translate(0, -50%);
  transform: translate(0, -50%);
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
}
.switch-label:before {
  left: 1px;
  width: 34px;
  height: 14px;
  background-color: #9E9E9E;
  border-radius: 8px;
}
.switch-label:after {
  left: 0;
  width: 20px;
  height: 20px;
  background-color: #FAFAFA;
  border-radius: 50%;
  box-shadow: 0 3px 1px -2px rgba(0, 0, 0, 0.14), 0 2px 2px 0 rgba(0, 0, 0, 0.098), 0 1px 5px 0 rgba(0, 0, 0, 0.084);
}
.switch-label .toggle--on {
  display: none;
}
.switch-label .toggle--off {
  display: inline-block;
}
.switch-input:checked + .switch-label:before {
  background-color: #A5D6A7;
}
.switch-input:checked + .switch-label:after {
  background-color: #4CAF50;
  -ms-transform: translate(80%, -50%);
  -webkit-transform: translate(80%, -50%);
  transform: translate(80%, -50%);
}
.switch-input:checked + .switch-label .toggle--on {
  display: inline-block;
}
.switch-input:checked + .switch-label .toggle--off {
  display: none;
}