body {
    margin: 20;
    padding: 20;
}
svg {
    font-family: monospace;
    letter-spacing: 0.3em;
}
#text_clock {
    font-size: 40px;
    fill: #e5e5e5;
    width: 420px;
    height: 420px;
    margin: auto auto;
}
#text_clock tspan.show {
    fill: #4682B4;
}