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HTML

CSS

CSS Base

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HTML

              
                <div class="cntr">
  <input type="radio" name="rdo" id="opt1" class="hidden-xs-up"/>
  <label for="opt1" class="radio"></label>
  <label for="opt1" class="rlabel">Left</label>
  <input type="radio" name="rdo" id="opt2" class="hidden-xs-up"/>
  <label for="opt2" class="radio"></label>
  <label for="opt2" class="rlabel">Right</label>
</div>
              
            
!

CSS

              
                .radio
  position relative
  top 1px
  width 18px
  height 18px
  border 1px solid #C8CCD4
  border-radius 100%
  vertical-align middle
  cursor pointer
  &:after
    content ''
    position absolute
    top 2px
    left 2px
    width 12px
    height 12px
    border-radius 100%
    background #666CF0
    transform scale(0)
  &:not(:first-child)
    margin-left 20px

.rlabel
  position relative
  top 1px
  vertical-align middle
  cursor pointer
  
input[type="radio"]:checked + .radio
  border-color #6871F1
  animation jelly .6s ease forwards
  &:after
    transform scale(1)
    transition all .2s ease
   
@keyframes jelly
  from
    transform scale(1, 1)
  30%
    transform scale(1.25, 0.75)
  40%
    transform scale(0.75, 1.25)
  50%
    transform scale(1.15, 0.85)
  65%
    transform scale(.95, 1.05)
  75%
    transform scale(1.05, .95)
  to
    transform scale(1, 1)

.cntr
  position absolute
  top 50%
  left 0
  width 100%
  text-align center
              
            
!

JS

              
                
              
            
!
999px

Console