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                      <main>
            <div class="container">
                <input type="radio" class="radio" id="radio-1" name="group"/>
                <label for="radio-1"></label>
                <input type="radio" class="radio" id="radio-2" name="group"/>
                <label for="radio-2"></label>
                <input type="radio" class="radio" id="radio-3" name="group"/>
                <label for="radio-3"></label>
                <input type="radio" class="radio" id="radio-4" name="group"/>
                <label for="radio-4"></label>
            </div>
        </main>
            
          
!
            
              @keyframes fade {
    0%, 50% {
        opacity: 0;
        transform: scale(0);
    }
}
@keyframes dot-anim {
    0% {
        top: -4vw;
    }
    50% {
        top: 4vw;
    }
    100% {
        top: -4vw;
    }
}
@keyframes checked-radio-3 {
    0% {
        top: -10vw;
        transform: scale(0);
    }
    100% {
        top: 0;
        transform: scale(1);
    }
}
@keyframes unchecked-radio-3 {
    0% {
        bottom: 0;
        transform: scale(1);
    }
    100% {
        bottom: -10vw;
        transform: scale(0);
    }
}
@keyframes checked-radio-4 {
    0% {
        transform: rotate(0) translateY(-4.8vw) scale(.2);
    }
    83% {
        transform: rotate(360deg) translateY(-2.5vw) scale(1);
        transform-origin: 2vw;
    }
    88% {
        transform: translateY(.6vw) scale(1);
    }
    93% {
        transform: translateY(-.9vw) scale(1);
    }
    100% {
        transform: translateY(0) scale(1);
    }
}
@keyframes unchecked-radio-4 {
    25% {
        top: -6.5vw;
    }
    50% {
        top: 9vw;
    }
    75% {
        top: -10vw;
    }
    100% {
        top: -10vw;
        transform: scale(0);
    }
}
*, *:before, *:after {
    margin: auto;
    padding: 0;
    outline: 0;
    overflow: hidden;
    box-sizing: border-box;
}
html, body { background: white; }
main, .container, label, label:before, label:after {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}
main {
    width: 95vw;
    height: 50vw;
}
.container {
    width: 100%;
    height: 100%;
    animation: fade 1s;
}
label {
    display: inline-block;
    width: 10vw;
    height: 10vw;
    border-radius: 50%;
    transition: all .2s ease-in-out;
    animation-timing-function: ease-in-out;
    animation-iteration-count: infinite;
    animation-duration: 1.6s;
    animation-name: dot-anim;
}
.radio:checked + label {
    animation-play-state: paused;
}
label:before {
    content: "";
    position: absolute;
    width: 5vw;
    height: 5vw;
    background: white;
    border-radius: 50%;
    box-shadow: rgba(0, 0, 0, 0.117647) 0 0 .8vw 0, rgba(0, 0, 0, 0.239216) 0 .8vw .8vw 0;
    transition: all .2s;
}
label:hover:before {
    box-shadow: rgba(0, 0, 0, 0.0784314) 0 0 1vw 0, rgba(0, 0, 0, 0.239216) 0 1vw 1vw 0;
}
label:after {
    content: "";
    position: absolute;
    width: 10vw;
    height: 10vw;
    background: rgba(255, 255, 255, .5);
    border-radius: 50%;
    transform: scale(0);
}
.radio:checked + label:after {
    background: transparent;
    transition: all .5s;
    transform: scale(1);
}
/**** BLUE Radio button code ****/
#radio-1 + label {
    left: -60vw;
    background: #4285F4;
    animation-delay: 0s;
}
#radio-1 + label:before {
    transform: scale(0);
}
#radio-1:checked + label:before {
    transform: scale(1);
    transition: all .4s;
}
/**** RED radio button code ****/
#radio-2 + label {
    left: -20vw;
    background: #EA4335;
    border-color: #EA4335!important;
    animation-delay: .2s;
}
#radio-2:checked + label {
    background: white;
    border: 1vw solid;
    box-shadow: inset rgba(0, 0, 0, 0.117647) 0 0 .6vw 0, inset rgba(0, 0, 0, 0.239216) 0 .6vw .8vw 0;
    transition: all .2s;
}
#radio-2:checked + label:before {
    width: 5vw;
    height: 5vw;
    background: #EA4335;
    transition: all .4s;
}
/* for IE */
#radio-2:not(:checked) + label:before {
    width: 8vw;
    height: 8vw;
    background: #EA4335;
    box-shadow: none;
}
/**** YELLOW radio button code ****/
#radio-3 + label {
    left: 20vw;
    background: #FBBC05;
    animation-delay: .4s;
}
#radio-3 + label:before {
    /* background: #E91E63; */
    transform: scale(0);
    animation-name: unchecked-radio-3;
    animation-duration: .2s;
    animation-timing-function: ease-in-out;
}
#radio-3:checked + label:before {
    animation-name: checked-radio-3;
    animation-duration: .4s;
    animation-timing-function: ease-in-out;
    animation-fill-mode: both;
}
/**** GREEN radio button code ****/
#radio-4 + label {
    left: 60vw;
    background: #34A853;
    animation-delay: .6s;
}
#radio-4 + label:before {
    /* background: #8BC34A; */
    animation: unchecked-radio-4 .5s both;
}
#radio-4:checked + label:before {
    animation-name: checked-radio-4;
    animation-duration: .6s;
    animation-timing-function: cubic-bezier(0.22, 0.61, 0.36, 1);
    animation-fill-mode: both;
}
[type="radio"] {
    display: none;
}
            
          
!
            
              // Just check/uncheck to see the effects transitions.





//          Inspiration

//design.google.com/articles/evolving-the-google-identity/
            
          
!
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