body {
    background: #000;
    color: #FFF;
    overflow: hidden;
    margin: 2em 1em 1em 1em;
    font-family: Arial;
}
input, button, label {
    position: relative;
    z-index: 2;
}
input {
    font-size: 1.2em;
    filter: invert(100%);
    width: 5em;
    margin-bottom: 0.1em;
    border-style: none;
}
button {
    filter: invert(100%);
    font-size: 1.2em;
    /* color: #FFF; */
    margin-right: 0.1em;
    /* background: #000; */
    /* border: 1px solid #333; */
}
label {
    margin-left: 0.5em;
}
canvas {
    position: absolute;
    z-index: 1;
    top: 0;
    left: 0;
}