body {
    background-color: #111;
    display: flex;
    justify-content: center;
    align-items: center;
    color: beige;
    flex-direction: column;
    font-size: 16px;
}

.header {
    display: flex;
    width: 100%;
    flex-direction: column;
    align-items: center;
}
h2 {
    margin: 10px;
}
.header .descr {
    font-size: 1.1rem;
    color: beige;
    padding: 10px;
    flex-basis: 1 0 100%;
}
.controls {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 10px;
}

.controls > div {
    margin: 5px;
}
canvas {
    border: 1px white solid;
}
.inline-label {
    font-weight: bold;
    color: chocolate;
}
.inline-label2 {
    color: cadetblue;
}