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HTML 

              
                <div id="root"></div>
  <script src="https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js"></script>
!

CSS 

              
                * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Rubik', sans-serif;
}

:root {
    --element-color: rgb(243, 243, 243);
    --element-muted: rgba(240, 240, 240, 0.5);
}

body {
    background: radial-gradient(rgb(24, 63, 100), rgb(11, 21, 31));
    color: var(--element-color);
}

.flex-column-h-center {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--element-muted);
}

.text-spaced {
    letter-spacing: 4px;
}

.loading-bar-bg {
    width: 100%;
    margin: 40px 0;
    height: 4px;
    border: none;
    background-color: var(--element-muted);
    box-shadow: 10px 6px 12px rgba(0, 0, 0, 0.596);
    border-radius: 50px;
}

.loading-bar {
    background-color: var(--element-color);
    width: 100%;
    height: 100%;
    transition: width 1s linear;
    border-radius: 50px;
}

.btn {
    border: 2px solid var(--element-muted);
    border-radius: 100px;
    background: none;
    padding: 10px 13px;
    font-size: 1rem;
    margin: 0 10px;
    cursor: pointer;
    color: var(--element-muted);
    transition: color .3s, border-color .3s, transform .3s;
}

.btn:hover {
    border-color: var(--element-color);
    color: var(--element-color);
    transform: translate3d(0, -4px, 0);
}

.btn:disabled {
    color: var(--element-muted);
    border-color: var(--element-muted);
    transform: translate3d(0, 0, 0);
    cursor: not-allowed;
}

.settings-number {
    font-size: 2rem;
}

#main {
    height: 100vh;
}

#clock-container {
    margin-top: 20vh;
}

#time-left {
    font-size: 6rem;
    line-height: 1;
    font-family: 'Anonymous Pro', monospace;
}

#time-left-label-container {
    margin-top: 50px;
    padding: 50px 50px 10px 50px;
}

#length-settings-group-container {
    display: flex;
}

.length-settings-group {
    padding: 0 50px;
}

#main-heading {
    font-size: 2rem;
    font-weight: normal;
}

@media (max-width: 500px) {
    #time-left {
        font-size: 4rem;
    }

    .length-settings-group {
        padding: 0 5px;
    }

    #main-heading {
        font-size: 1.5rem;
    }

    #clock-container {
        margin-top: 50px;
    }
}
!

JS 

              
                class PomodoroClock extends React.Component {
  constructor() {
    super();
    this.resetClock = this.resetClock.bind(this);
    this.updateTimerSetting = this.updateTimerSetting.bind(this);
    this.startOrStopTimer = this.startOrStopTimer.bind(this);
    this.countDownOneSecond = this.countDownOneSecond.bind(this);
  }

  state = {
    breakLength: 5,
    breakLengthLeft: 5,
    sessionLength: 25,
    sessionLengthLeft: 25,
    timerIsRunning: false,
    seconds: 0,
    intervalHandle: 0,
    breakOngoing: false,
    displayTextBetweenSessions: "",
    loadingBarWidth: 100
  };

  startOrStopTimer() {
    this.setState({ timerIsRunning: !this.state.timerIsRunning });
    if (this.state.timerIsRunning) clearInterval(this.state.intervalHandle);
    else {
      let handle = setInterval(this.countDownOneSecond, 1000);
      this.setState({ intervalHandle: handle });
    }
  }

  resetClock() {
    this.setState({
      breakLength: 5,
      breakLengthLeft: 5,
      sessionLength: 25,
      sessionLengthLeft: 25,
      seconds: 0,
      timerIsRunning: false,
      breakOngoing: false,
      loadingBarWidth: 100
    });
    clearInterval(this.state.intervalHandle);
    document.getElementById("beep").pause();
    document.getElementById("beep").currentTime = 0;
  }

  // Increases or decreases the specified timer (sessionTimer or breakTimer) by 1 minute if no timer is currently running
  updateTimerSetting(timerName, timeAmount) {
    if (this.state.timerIsRunning) return;

    if (
      this.state[timerName] + timeAmount >= 1 &&
      this.state[timerName] + timeAmount <= 60
    ) {
      const timerNameLeft = timerName + "Left";
      this.setState(prevState => ({
        [timerName]: prevState[timerName] + timeAmount,
        [timerNameLeft]: prevState[timerName] + timeAmount
      }));
    }
  }

  countDownOneSecond() {
    if (this.state.seconds - 1 < 0) {
      // The block below manages the minute-timer when a break is going on
      if (this.state.breakOngoing) {
        if (this.state.breakLengthLeft - 1 < 0) {
          this.setState({
            breakLengthLeft: this.state.breakLength,
            breakOngoing: false,
            displayTextBetweenSessions: "SESSION"
          });
          setTimeout(() => {
            this.setState({ displayTextBetweenSessions: "" });
          }, 1000);
          document.getElementById("beep").play();
        } else
          this.setState(prevState => ({
            breakLengthLeft: prevState.breakLengthLeft - 1,
            seconds: 59
          }));
      } else {
        // The block below manages the minute-timer when a session (no break) is going on
        if (this.state.sessionLengthLeft - 1 < 0) {
          this.setState({
            sessionLengthLeft: this.state.sessionLength,
            breakOngoing: true,
            displayTextBetweenSessions: "BREAK"
          });
          setTimeout(() => {
            this.setState({ displayTextBetweenSessions: "" });
          }, 1000);
          document.getElementById("beep").play();
        } else
          this.setState(prevState => ({
            sessionLengthLeft: prevState.sessionLengthLeft - 1,
            seconds: 59
          }));
      }
    } else
      // Seconds decrease independently of break or session status
      this.setState(prevState => ({ seconds: prevState.seconds - 1 }));

    // calculate and set new loading bar width
    const secondsLeft =
      (this.state.breakOngoing
        ? this.state.breakLengthLeft
        : this.state.sessionLengthLeft) *
        60 +
      this.state.seconds;
    const initialTimeInSeconds =
      (this.state.breakOngoing
        ? this.state.breakLength
        : this.state.sessionLength) * 60;
    const loadingBarWidth = secondsLeft / initialTimeInSeconds * 100;
    this.setState({ loadingBarWidth });
  }

  render() {
    // Gets last two digits (eg. 020 becomes 20, 07 becomes 7)
    const formattedSeconds = ("0" + this.state.seconds).slice(-2);
    const currentActiveTimerLeft = this.state.breakOngoing
      ? this.state.breakLengthLeft
      : this.state.sessionLengthLeft;
    const formattedMinutes = ("0" + currentActiveTimerLeft).slice(-2);
    let displayText = formattedMinutes + ":" + formattedSeconds;

    let startStopButtonStyles = this.state.timerIsRunning
      ? "fas fa-pause"
      : "fas fa-play";

    return (
      <main id="main" className="flex-column-h-center">
        <div className="flex-column-h-center" id="clock-container">
          <h1 id="main-heading" className="text-center text-muted">
            <span className="far fa-clock" /> Pomodoro Clock
          </h1>
          <div id="time-left-label-container">
            <p id="timer-label" className="text-muted text-spaced">
              {this.state.breakOngoing ? "BREAK" : "SESSION"}
            </p>
            <p id="time-left" className="text-center">
              {displayText}
            </p>
          </div>
          <div>
            <button
              id="start_stop"
              className="btn"
              onClick={this.startOrStopTimer}
            >
              <span className={startStopButtonStyles} />
            </button>
            <button id="reset" className="btn" onClick={this.resetClock}>
              <span className="fas fa-stop" />
            </button>
          </div>
          <div className="loading-bar-bg">
            <div
              className="loading-bar"
              style={{ width: this.state.loadingBarWidth + "%" }}
            />
          </div>
          <div id="length-settings-group-container">
            <div className="length-settings-group flex-column-h-center">
              <p id="break-label" className="text-muted text-spaced">
                BREAK
              </p>
              <p id="break-length" className="settings-number">
                {this.state.breakLength}
              </p>
              <div>
                <button
                  disabled={this.state.timerIsRunning}
                  id="break-increment"
                  className="btn"
                  onClick={() => {
                    this.updateTimerSetting("breakLength", 1);
                  }}
                >
                  <span className="fas fa-plus" />
                </button>
                <button
                  disabled={this.state.timerIsRunning}
                  id="break-decrement"
                  className="btn"
                  onClick={() => {
                    this.updateTimerSetting("breakLength", -1);
                  }}
                >
                  <span className="fas fa-minus" />
                </button>
              </div>
            </div>
            <div className="length-settings-group flex-column-h-center">
              <p id="session-label" className="text-muted text-spaced">
                SESSION
              </p>
              <p id="session-length" className="settings-number">
                {this.state.sessionLength}
              </p>
              <div>
                <button
                  disabled={this.state.timerIsRunning}
                  id="session-increment"
                  className="btn"
                  onClick={() => {
                    this.updateTimerSetting("sessionLength", 1);
                  }}
                >
                  <span className="fas fa-plus" />
                </button>
                <button
                  disabled={this.state.timerIsRunning}
                  id="session-decrement"
                  className="btn"
                  onClick={() => {
                    this.updateTimerSetting("sessionLength", -1);
                  }}
                >
                  <span className="fas fa-minus" />
                </button>
              </div>
            </div>
          </div>
          <audio id="beep" preload="auto" src="https://goo.gl/65cBl1" />
        </div>
      </main>
    );
  }
}

ReactDOM.render(<PomodoroClock />, document.getElementById("root"));
!
999px

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