html, body, * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    border: none; 
    background-repeat: no-repeat;
}
html, body {
    background-color: rgb(0, 0, 0);
    height: 100%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}
html {
    -moz-text-size-adjust: none;
    -webkit-text-size-adjust: none;
    text-size-adjust: none;
    font-size: 62.5%;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Droid Sans", "Helvetica Neue", Arial, sans-serif;
    font-size: 1.6em;
    line-height: 1.4;
    padding: 30px;
}
canvas {
    background: transparent;
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
}