stopwatch {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}
stopwatch .buttons-container { margin-top: 10px; }
stopwatch .time-field {
    display: flex;
    flex-direction: column;
    align-items: center;
}
stopwatch .field-container label { align-self: flex-start; }
stopwatch .field-container > span {
    font-size: 2.4rem;
    margin: 10px 0 0 0;
}
stopwatch #total-horas {
    margin: 10px 0;
    font-size: 1rem;
}