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HTML

CSS

:root {
    --bg: #2E3B4E; 
    --primary: #FF6F61; 
    --solid: #FFFFFF; 
    --btn-w: 10em;
    --dot-w: calc(var(--btn-w) * 0.2);
    --tr-X: calc(var(--btn-w) - var(--dot-w));
}

* {
    box-sizing: border-box;
}

*:before, *:after {
    box-sizing: border-box;
}

body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-flow: wrap;
    background: var(--bg);
    font-size: 20px;
    font-family: 'Titillium Web', sans-serif;
}

h1 {
    color: var(--solid);
    font-size: 2.5rem;
    margin-top: 6rem;
}

.btn {
    position: relative;
    margin: 0 auto;
    width: var(--btn-w);
    color: var(--primary);
    border: .15em solid var(--primary);
    border-radius: 5em;
    text-transform: uppercase;
    text-align: center;
    font-size: 1.3em;
    line-height: 2em;
    cursor: pointer;
}

.dot {
    content: '';
    position: absolute;
    top: 0;
    width: var(--dot-w);
    height: 100%;
    border-radius: 100%;
    transition: all 300ms ease;
    display: none;
}

.dot:after {
    content: '';
    position: absolute;
    left: calc(50% - .4em);
    top: -.4em;
    height: .8em;
    width: .8em;
    background: var(--primary);
    border-radius: 1em;
    border: .25em solid var(--solid);
    box-shadow: 0 0 .7em var(--solid), 0 0 2em var(--primary);
}

.btn:hover .dot,
.btn:focus .dot {
    animation: atom 2s infinite linear;
    display: block;
}

@keyframes atom {
   0% {transform: translateX(0) rotate(0);}
   30% {transform: translateX(var(--tr-X)) rotate(0);}
   50% {transform: translateX(var(--tr-X)) rotate(180deg);}
   80% {transform: translateX(0) rotate(180deg);}
   100% {transform: translateX(0) rotate(360deg);}
}