body {
    background-image: url("background.jpg");
    background-size: 100%;
    font-family: "Xanh Mono", monospace;
}

#big-container {
    height: 98vh;
    width: 98vw;
    opacity: 50%;
    background: white;
    margin: 3px;
    padding: 0;
}

#selection-container {
    display: flex;
    flex-direction: row;
}

.period-selector {
    padding: 0.25em;
    flex-grow: 1;
    text-align: center;
}

#timer-container {
    text-align: center;
    padding-top: 15cqh;
    padding: auto;
}

.timer-without-hours {
    font-size: 30cqw;
}

.timer-with-hours {
    font-size: 22cqw;
}

.selected-period {
    text-decoration: underline;
    font-weight: bold;
}

.selected-late-arrival {
    text-decoration: underline;
    font-weight: bold;
}