/**
 * @license
 * Copyright 2020 Harrison Fishco
 */

body {
    margin: 0;
}

img[src="metronome.png"] {
    display: block;
    margin: 0 auto;
}

img[src="bar.png"] {
    position: absolute;
    top: 74px;
    left: calc((100% - 36px) / 2);
}

img[src="bar.png"].active {
    transform-origin: bottom center;
    animation: metronome;
    animation-iteration-count: infinite;
    animation-direction: alternate;
    animation-timing-function: linear;
}

div.controls {
    text-align: center;
    margin-top: 16px;
}

div.wrapper > span {
    display: block;
}

div.wrapper > input {
    margin: 8px;
}

@keyframes metronome {
    0% {
        transform: rotate(45deg)
    }
    
    100% {
        transform: rotate(-45deg)
    }
}