<div class="custom_radio">
  <input type="radio" id="featured-1" name="featured" checked><label for="featured-1">Custom Radio Button 1</label>
  <br>
  <input type="radio" id="featured-2" name="featured"><label for="featured-2">Custom Radio Button 2</label>
  <br>
  <input type="radio" id="featured-3" name="featured"><label for="featured-3">Custom Radio Button 3</label>
</div>

body{
  align-items: center;
  background-color:#CDDC39;
  color:#827717;
  display: flex;
  font-family: 'Roboto', sans-serif;
  font-size: 32px;
  line-height: 1.5em;
  height: 100vh;
  margin: 0;
  justify-content: center;
}
.custom_radio{
   margin: 20px;
}
.custom_radio input[type="radio"]{
  display: none;
}
.custom_radio input[type="radio"] + label{
  position: relative;
  display: inline-block;
  padding-left: 1.5em;
  margin-right: 2em;
  cursor: pointer;
  line-height: 1em;
  -webkit-transition: all 0.3s ease-in-out;
  transition: all 0.3s ease-in-out;
}
.custom_radio input[type="radio"] + label:before,
.custom_radio input[type="radio"] + label:after{
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 1em;
  height: 1em;
  text-align: center;
  color: white;
  font-family: Times;
  border-radius: 50%;
  -webkit-transition: all .3s ease;
  transition: all .3s ease;
}
.custom_radio input[type="radio"] + label:before {
  -webkit-transition: all .3s ease;
  transition: all .3s ease;
  box-shadow: inset 0 0 0 0.2em white, inset 0 0 0 1em white;
}
.custom_radio input[type="radio"] + label:hover:before {
  -webkit-transition: all .3s ease;
  transition: all .3s ease;
  box-shadow: inset 0 0 0 0.3em white, inset 0 0 0 1em #c6c6c6;
}
.custom_radio input[type="radio"]:checked + label:before {
  -webkit-transition: all .3s ease;
  transition: all .3s ease;
  box-shadow: inset 0 0 0 0.2em white, inset 0 0 0 1em #4CAF50;
}