/*@-webkit-keyframes click-wave {
  0% {
    height: 40px;
    width: 40px;
    opacity: 0.35;
    position: relative;
  }
  100% {
    height: 200px;
    width: 200px;
    margin-left: -80px;
    margin-top: -80px;
    opacity: 0;
  }
}
@-moz-keyframes click-wave {
  0% {
    height: 40px;
    width: 40px;
    opacity: 0.35;
    position: relative;
  }
  100% {
    height: 200px;
    width: 200px;
    margin-left: -80px;
    margin-top: -80px;
    opacity: 0;
  }
}
@keyframes click-wave {
  0% {
    height: 40px;
    width: 40px;
    opacity: 0.35;
    position: relative;
  }
  100% {
    height: 200px;
    width: 200px;
    margin-left: -80px;
    margin-top: -80px;
    opacity: 0;
  }
}*/
@-webkit-keyframes 
click-wave { 
  0% {
 width: 40px;
 height: 40px;
 opacity: 0.35;
 position: relative;
}
 100% {
 width: 200px;
 height: 200px;
 margin-left: -80px;
 margin-top: -80px;
 opacity: 0.0;
}
}

@-moz-keyframes click-wave { 
0% {
 width: 40px;
 height: 40px;
 opacity: 0.35;
 position: relative;
}
 100% {
 width: 200px;
 height: 200px;
 margin-left: -80px;
 margin-top: -80px;
 opacity: 0.0;
}
}

@-o-keyframes click-wave { 0% {
 width: 40px;
 height: 40px;
 opacity: 0.35;
 position: relative;
}
 100% {
 width: 200px;
 height: 200px;
 margin-left: -80px;
 margin-top: -80px;
 opacity: 0.0;
}
}

@keyframes click-wave { 
  0% {
 width: 40px;
 height: 40px;
 opacity: 0.35;
 position: relative;
}
 100% {
 width: 200px;
 height: 200px;
 margin-left: -80px;
 margin-top: -80px;
 opacity: 0.0;
}
}   
.option-input {
  -webkit-appearance: none;
  -moz-appearance: none;
  -ms-appearance: none;
  -o-appearance: none;
  appearance: none;
  position: relative;
  top: 13.33333px;
  right: 0;
  bottom: 0;
  left: 0;
  height: 40px;
  width: 40px;
  -webkit-transition: all 0.15s ease-out 0s;
  -moz-transition: all 0.15s ease-out 0s;
  transition: all 0.15s ease-out 0s;
  background: #cbd1d8;
  border: none;
  color: #fff;
  cursor: pointer;
  display: inline-block;
  margin-right: 0.5rem;
  outline: none;
  position: relative;
  z-index: 1000;
}
.option-input:hover {
  background: #9faab7;
}
.option-input:checked {
  background: #40e0d0;
}
.option-input:checked:before {
  height: 40px;
  width: 40px;
  position: absolute;
  content: '\2716';
  display: inline-block;
  font-size: 26.66667px;
  text-align: center;
  line-height: 40px;
}
.option-input:checked:after {
  -webkit-animation: click-wave 0.65s;
  -moz-animation: click-wave 0.65s;
  animation: click-wave 0.65s;
  background: #40e0d0;
  content: '';
  display: block;
  position: relative;
  z-index: 100;
}
.option-input.radio {
  border-radius: 50%;
}
.option-input.radio::after {
  border-radius: 50%;
}

body div.container {
  padding: 5rem;
  margin-bottom: 20px;
}
body label {
  display: block;
  line-height: 40px;
}