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CSS

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JavaScript

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HTML 

              
                <div class="button">
	<input type="checkbox" id="liked"><label for="liked"><span></span></label>
</div>
!

CSS 

              
                /*#ff3c41*/
/*#444857*/

:root {
	--u: 1.5vmin;
	--clr: #777;
	--bg: #444857;
}
body {
	margin: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
	background-color: #131417;
	background-image: linear-gradient(315deg, #131417 0%, #1e1f26 74%);
}

.button {
	position: relative;
    width: calc(var(--u) * 10);
    height: calc(var(--u) * 10);
}

input { display: none; }	

label {
    background: var(--bg);
    width: 100%;
    height: 100%;
    position: absolute;
    border-radius: calc(var(--u) * 1.5);
	cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

label:before {
    content: "49";
    position: absolute;
    min-width: 50%;
    left: 25%;
    text-align: center;
    top: 0;
	bottom: 0;
    background: var(--bg);
    border-radius: calc(var(--u) * 2);
    font-size: calc(var(--u) * 2);
    font-family: Arial, Helvetica, serif;
    padding: calc(var(--u) * 0.5);
    box-sizing: border-box;
    color: var(--clr);
    line-height: calc(var(--u) * 2.25);
    z-index: -1;
	transition: all 0.5s ease 0s;
	animation: counter-bot 1s ease 0s;
}

input:checked + label:before {
    content: "50";
    color: #fff;
	background: #ff3c41; 
	
	bottom: inherit;
	transition: all 0.5s ease 0s;
	animation: counter-top 1s ease 0s;
}

@keyframes counter-top {
	70% { top: calc(var(--u) * -4.75); }
}

@keyframes counter-bot {
	70% { 
		top: inherit; 
		bottom: calc(var(--u) * -5); 
	}
}


label:after {	
	content: "";
    width: calc(var(--u) * 8);
    height: calc(var(--u) * 8);
    position: absolute;
    border-radius: 100%;
    box-sizing: border-box;
    z-index: -2;
    animation: disc-gray 1s ease 0s, spin-gray 0.65s ease-in-out 0.25s;
    transform: rotate(0deg);
	--pos: 95%;
    background: 
		radial-gradient(circle at 50% 50%, #fff0 0 62%, var(--bg) 63% 65%, #fff0 66% 100%), 
		radial-gradient(circle at 50% var(--pos), var(--bg) 0 4%, #fff0 4.5% 100%);
}

@keyframes spin-gray {
	100% {
		transform: rotate(-360deg);
	}
}

@keyframes spin-red {
	100% {
		transform: rotate(360deg);
	}
}

@keyframes disc-gray {
	70% {
		width: calc(var(--u) * 19);
		height: calc(var(--u) * 19);
	}
}

@keyframes disc-red {
	70% {
		width: calc(var(--u) * 19);
		height: calc(var(--u) * 19);
	}
}

input:checked + label:after {
	--bg: #ff3c41;
	--pos: 5%;
    animation: disc-red 1s ease 0s, spin-red 0.65s ease-in-out 0.25s;
}






label span {
	position: absolute;
	width: 100%;
	height: 100%;
	animation: dislike 0.5s ease 0s;
}
/*
label span:before {
    content: "";
    width: 2px;
    height: 2px;
    position: absolute;
    border-radius: calc(var(--u) * 5);
    transform: translate(calc(var(--u) * 2.235), calc(var(--u) * 4.5));
    border: calc(var(--u) * 2.71) solid transparent;
    border-top: calc(var(--u) * 2.9) solid var(--clr);
}

label span:after {
    content: "";
    background: 
		radial-gradient(circle at 40% 45%, var(--clr) 0 calc(var(--u) * 1.25), #fff0 calc(var(--u) * 1.325) 100%), 
		radial-gradient(circle at 60% 45%, var(--clr) 0 calc(var(--u) * 1.25), #fff0 calc(var(--u) * 1.325) 100%);
    width: 100%;
    height: 100%;
    position: absolute;
}
*/
label span:before {
	
	content: "";
    position: absolute;
    border-radius: 0.25vmin;
    border: 3.8vmin solid #fff0;
    border-top: 4vmin solid var(--clr);
    margin-top: 7.65vmin;
    margin-left: 3.8vmin;
	
}

label span:after {
    content: "";
    position: absolute;
    background: var(--clr);
    width: 5vmin;
    height: 5vmin;
    border-radius: 100%;
    margin-left: 3.35vmin;
    margin-top: 3.5vmin;
    box-shadow: 3.5vmin 0 0 0 var(--clr);
}

input:checked + label span {
	--clr: #ff3c41; 
	animation: like 0.5s ease 0s;
}


@keyframes like {
	75% { transform: scale(1.25); }
}
@keyframes dislike {
	75% { transform: scale(0.75); }
}






.button:hover label span:before, .button:hover label span:after {
    --clr: #9d4958;
}

.button:hover input:checked + label span:before, .button:hover input:checked + label span:after {
    --clr: #ff3c41; 
}
!

JS 

              
                //Inpired by this pen from Jhey:
//https://codepen.io/jh3y/pen/bGYoEwX
!
999px

Console