{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
 }

 button {
    appearance: none;
    border: none;
    outline: none;
    background: none;

    cursor: pointer;
 }

 body {
    background-color: #0f172a;
 }

 main {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 4rem 2rem;
 }

 .mic-toggle {
    position: relative;
    display: block;
    width: 8rem;
    height: 8rem;
    border-radius: 50%;
    background-color: crimson;
    margin-bottom: 4rem;
 }

 .mic-toggle:after,
 .mic-toggle:before {
    --pad: 0rem;
    content: '';
    display: block;
    position: absolute;
    z-index: 0;
    background-color: rgba(220, 20, 60, 0.2);
    top: var(--pad);
    left: var(--pad);
    right: var(--pad);
    bottom: var(--pad);
    border-radius: 50%;
 }

 .mic-toggle:after {
    transition: 0.4s;
 }

 .mic-toggle:before {
    transition: 0.2s;
 }

 .mic-toggle:hover:before {
    --pad: -1rem;
 }

 .mic-toggle:hover:after {
    --pad: -2rem;
 }

 .mic-toggle span {
    position: relative;
    z-index: 1;
    color: #fff;
    font-size: 6rem;
 }

 .mic-toggle.is-recording:after {
    animation: smoothPadAfter 0.6s ease-in alternate-reverse forwards infinite;
 }

 .mic-toggle.is-recording:before {
    animation: smoothPadBefore 0.6s ease-in alternate-reverse forwards infinite;
 }

 @keyframes smoothPadAfter {
    0% {
        top: -2rem;
        left: -2rem;
        right: -2rem;
        bottom: -2rem;
    }

    100% {
        top: -1rem;
        left: -1rem;
        right: -1rem;
        bottom: -1rem;
    }
 }

 @keyframes smoothPadBefore {
    0% {
        top: -1rem;
        left: -1rem;
        right: -1rem;
        bottom: -1rem;
    }

    100% {
        top: -0.5rem;
        left: -0.5rem;
        right: -0.5rem;
        bottom: -0.5rem;
    }
 }

 .playback {
    margin-bottom: 1rem;
    box-shadow: 0px 0px 1rem rgba(0, 0, 0, 0.2);
    border-radius:  999px;
 }

 .is-hidden {
    display: none;
 }