* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-size: 16px;
    line-height: 1.8;

    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

    height: 100vh;
    overflow: hidden;
    background-color: #f4f4f4;

    padding: 20px;
}

h1 {
    font-size: 1.5em;
    margin-bottom: 20px;
}

canvas {
    border: solid 1px #ccc;
    background-color: #fff;

}