*, *::before, *::after {
  box-sizing: inherit;
}
 
.h3 {
  font-size: 2.5rem;
  margin-left: 5px;
  color:#555;
}

.swappy-radios {
  width: 75%; 
  margin: 30px auto;
}

.swappy-radios label {
  display: block;
  position: relative;
  padding-left: 4rem;
  margin-bottom: 1.5rem;
  cursor: pointer;
  font-size: 2rem;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  color: #555;
}
.swappy-radios label:hover input ~ .radio {
  opacity: 0.8;
}
.swappy-radios input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

.swappy-radios input:checked ~ .radio::after {
  opacity: 1;
}

.swappy-radios .radio::after {
  display: block;
  content: '';
  position: absolute;
  opacity: 0;
  top: .5rem;
  left: .5rem;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: #fff;
}