* {
    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: #eee;
}
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;
    }    
}

.mic-toggle.is-recording{
    background-color: green;
}

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

.is-hidden {
    display: none;
}

.material-symbols-outlined {
  font-variation-settings:
  'FILL' 0,
  'wght' 300,
  'GRAD' 0,
  'opsz' 24
}