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HTML 

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

CSS 

              
                *{
  text-align: center;
}
#app{
  height: 100vh;
  overflow: scroll;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2vw;
  overflow: scroll;
}
#setTime{
  min-height: 60vh;
}
#setBreak{
  min-height: 60vh;
}
#timer-label{
  height: 60vh;

}
.miniDisplay{
  margin: 5vh auto 5vh auto ;
  max-width: 15vw;
  width: 15vw;
  height: 20vh;
/*   border: .3px solid grey; */
  border-radius: 5px;
  box-shadow: rgba(149, 157, 165, 0.2) 0px 8px 8px;
  font-size: 80px;
  text-align: center;
}
h2{
  margin-top: 5vh;
  font-size: 30px;
  font-family: sans-serif, georgia;
}
 .timeD{
   margin-left: 5%;
  width: 90%;
  font-size: 90px;
  margin-top: 10vh;
  margin-bottom: 8vh;
  border-radius: 5px;
  box-shadow: rgba(149, 157, 165, 0.2) 0px 8px 8px ;
}
#timer-label{
  width: 30vw;
}

#play{
  margin-top: 10vh;
}
p{
  font-size: 50px;
}

.disabled{
  fill: rgb(80,80,80);
}
!

JS 

              
                import * as React from "https://cdn.skypack.dev/react@17.0.1";
import * as ReactDOM from "https://cdn.skypack.dev/react-dom@17.0.1";

const App = () => {
  const [time, setTime] = React.useState(25);
  const [rest, setRest] = React.useState(5);
  const [count, setCount] = React.useState(time*60);
  const [timer, setTimer] = React.useState();
  let countTime = count;
  let breakTime = rest * 60;
  const [clicked, setClicked] = React.useState(false);
  
   const handleTimeIncrease = () =>{
     if (time <= 59){
     setTime((time) => time+=1);
     setCount((count) => count+=60);
     }
   }            
      
   const handlePlay = () => {
     setClicked (!clicked);
     setTimer(setInterval(() => {
      if (countTime == 0 && breakTime == 0){
        clearInterval(timer)
      } 
       else if (countTime == 0 & breakTime !=0) {
        (breakTime >= 1) ? breakTime -= 1 : breakTime = 0; 
         setCount(breakTime)
       }
       else{
        (countTime >= 1) ? countTime -= 1 : countTime = 0;
         setCount(countTime)
      }
     }, 1000));
   }
  const handlePause = () => {
    clearInterval(timer);
    setClicked(false);
  } 
  const handleReset = () => {
    clearInterval(timer);
    setRest(5);
    setTime(25);
    setCount(25*60);
    setClicked(false);
  }
  
  return(
    <div id="app"
      className="bg-blue-300 aspect-square"
      >
    <div 
      id="setTime"
      className="w-56 bg-white shadow rounded "
      >
      <h2 id="session-label"> Session Length </h2>
      <div
        id="session-length"
        className="miniDisplay"
        >{time}</div>
      <button 
id="session-increment"        className="controls"
        onClick ={handleTimeIncrease}
        >
        <svg xmlns="http://www.w3.org/2000/svg" className="h-10 w-10" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
  <path strokeLinecap="round" strokeLinejoin="round" d="M9 11l3-3m0 0l3 3m-3-3v8m0-13a9 9 0 110 18 9 9 0 010-18z" />
</svg>
</button>
      <button
        
id="session-decrement"        className="controls"
        onClick ={() =>{ setTime((time) => (time >= 2 ) ? time-=1 : time=1)
       setCount((count) => (count >60 ) ? count-=60: count=60)
                       }}
        >
        <svg xmlns="http://www.w3.org/2000/svg" class="h-10 w-10" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
  <path stroke-linecap="round" stroke-linejoin="round" d="M15 13l-3 3m0 0l-3-3m3 3V8m0 13a9 9 0 110-18 9 9 0 010 18z" />
</svg>
  
</button>
    </div>
      <div
       id="timer-label"
       className="w-64 bg-white shadow rounded"
       >
        <div className="timeD">
       <h1 id="time-left">
          {Math.floor(countTime/60)}:{(countTime%60 <10) ? "0" +  parseInt(countTime%60, 10): parseInt(countTime%60, 10)}
        </h1>
        </div>
        <div id ="start_stop">
        <button
          onClick={handlePlay}
          disabled={clicked}
          >
          <svg xmlns="http://www.w3.org/2000/svg" className={(clicked) ? "h-10 w-10 disabled" : "h-10 w-10"} viewBox="0 0 20 20" fill="vlue">
  <path fillRule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zM9.555 7.168A1 1 0 008 8v4a1 1 0 001.555.832l3-2a1 1 0 000-1.664l-3-2z" clipRule="evenodd" />
</svg>
        </button>
        <button
          onClick={handlePause}
          >
          <svg xmlns="http://www.w3.org/2000/svg" className="h-10 w-10" viewBox="0 0 20 20" fill="currentColor">
  <path fillRule="evenodd" d="M18 10a8 8 0 11-16 0 8 8 0 0116 0zM7 8a1 1 0 012 0v4a1 1 0 11-2 0V8zm5-1a1 1 0 00-1 1v4a1 1 0 102 0V8a1 1 0 00-1-1z" clipRule="evenodd" />
</svg>
        </button>
        <button
          id="reset"
          onClick={handleReset}
          >
          <svg xmlns="http://www.w3.org/2000/svg" className="h-10 w-10" viewBox="0 0 20 20" fill="currentColor">
  <path fillRule="evenodd" d="M4 2a1 1 0 011 1v2.101a7.002 7.002 0 0111.601 2.566 1 1 0 11-1.885.666A5.002 5.002 0 005.999 7H9a1 1 0 010 2H4a1 1 0 01-1-1V3a1 1 0 011-1zm.008 9.057a1 1 0 011.276.61A5.002 5.002 0 0014.001 13H11a1 1 0 110-2h5a1 1 0 011 1v5a1 1 0 11-2 0v-2.101a7.002 7.002 0 01-11.601-2.566 1 1 0 01.61-1.276z" clipRule="evenodd" />
</svg></button>
        </div>
      </div>
      
    <div
      id="setBreak"
      className="w-56 bg-white shadow rounded"
      >
      <h2 id="break-label"> Break Length</h2>
      <div id="break-length" className="miniDisplay">{rest}</div>
      <button
        id="break-increment"
        className="controls"
        onClick ={() => setRest((rest) => (rest <= 59) ? rest+=1 : rest=60)
                 }
        ><svg xmlns="http://www.w3.org/2000/svg" className="h-10 w-10" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
  <path strokeLinecap="round" strokeLinejoin="round" d="M9 11l3-3m0 0l3 3m-3-3v8m0-13a9 9 0 110 18 9 9 0 010-18z" />
</svg></button>
      <button
        id="break-decrement"
        className="controls"
        onClick ={() => {setRest((rest) => (rest>= 2 ) ? rest-=1: rest =1)}}
        ><svg xmlns="http://www.w3.org/2000/svg" class="h-10 w-10" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
  <path stroke-linecap="round" stroke-linejoin="round" d="M15 13l-3 3m0 0l-3-3m3 3V8m0 13a9 9 0 110-18 9 9 0 010 18z" />
</svg></button>
      
     </div>
      </div>
  )
}

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

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