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              <div class="straps">
  <div class="watch">
    <div class="face">
      <div class="hands">
        <div class="hand hand--hour"></div>
        <div class="hand hand--minute"></div>
        <div class="hand hand--second"></div>
      </div>  
    </div>
  </div>
</div>
            
          
!
            
              :root {
  // --detail-color: #F2CCB0;
  --detail-color: #aaa;
  --size-factor: 4rem;
  --rotation: 0deg;
  --clock-hand-transition: transform .1s ease-in-out;
}

body {
  background-image: url('https://images.unsplash.com/photo-1504333638930-c8787321eee0?auto=format&fit=crop&w=2550&q=80'); //linear-gradient(to bottom, #97BAD8, #90DFE5);
  background-position: 50% 50%;
  background-size: cover;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-rows: 1fr auto 1fr;
  grid-template-areas: 
    '. . .'
    '. watch .'
    '. . .';
  margin: 0; 
  min-height: 100vh;
  padding: 0;
}

.straps {
  background-color: #84654F;
  border-radius: 0 0 calc(.4 * var(--size-factor)) calc(.4 * var(--size-factor));
  box-shadow: 0 1px 5px rgba(0,0,0, .3);
  grid-area: watch;
  height: calc(7 * var(--size-factor));
  position: relative;
  width: calc(1 * var(--size-factor));

  &::before,
  &::after {
    left: 50%;
    position: absolute;
    transform: translateX(-50%);
  }
  
  &::before {
    border: 6px solid;
    border-radius: 3px 3px 0 0;
    box-shadow: 0 0 7px rgba(0, 0, 0, .5);
    box-sizing: border-box;
    content: '|';
    color: var(--detail-color);
    font-family: Helvetica, Arial, sans-serif;
    font-size: calc(.28 * var(--size-factor));
    font-weight: 900;
    height: calc(.5 * var(--size-factor));
    line-height: calc(.5 * var(--size-factor));
    text-align: center;
    top: calc(-.5 * var(--size-factor));
    width: 100%;
  }
  
  &::after {
    background-image: linear-gradient(to top, 
      transparent 20%, rgba(0,0,0, .5) 20.1%, rgba(0,0,0, .5) 21.3%, transparent 21.4%, 
      transparent 30%, rgba(0,0,0, .5) 30.1%, rgba(0,0,0, .5) 31.3%, transparent 31.4%, 
      transparent 40%, rgba(0,0,0, .5) 40.1%, rgba(0,0,0, .5) 41.3%, transparent 41.4%, 
      transparent 50%, rgba(0,0,0, .5) 50.1%, rgba(0,0,0, .5) 51.3%, transparent 51.4%);
    bottom: 0;
    content: '';
    height: 50%;
    width: 25%;
  }
}

.watch {
  border: 4px solid var(--detail-color);
  border-radius: 50%;
  height: calc(2 * var(--size-factor));
  left: 50%;
  position: absolute;
  top: 30%;
  transform: translateX(-50%);
  width: calc(2 * var(--size-factor));
  
  &::before,
  &::after {
    background-image: linear-gradient(to right, var(--detail-color) 15%, transparent 16%, transparent 84%, var(--detail-color) 85%);
    content: '';
    height: calc(.2 * var(--size-factor));
    left: 50%;
    position: absolute;
    transform: translateX(-50%);
    width: calc(1.2 * var(--size-factor));
  }
  
  &::before {
    top: calc(.02 * var(--size-factor));
  }
  &::after {
    bottom: calc(.02 * var(--size-factor));
  }
}

.face {
  background-color: #ffffff;
  border-radius: 50%;
  box-shadow: 0 1px 5px rgba(0,0,0, .3);
  height: 100%;
  position: absolute;
  width: 100%;
  z-index: 1;
}

.hands {
  height: 100%;
  width: 100%;
}

.hand {
  background-color: var(--detail-color);
  left: 50%;
  position: absolute;
  top: 0;
  transform: translate(-50%, 5%) rotate(var(--rotation));
  transform-origin: 50% 92%;
  transition: var(--clock-hand-transition);
  width: 1px;
  
  &--hour {
    height: 30%;
    top: 20%;
    width: 2px;
  }
  
  &--minute {
    height: 38%;
    top: 12%;
    width: 2px;
  }
  
  &--second {
    height: 42%;
    top: 8%;
    width: 1px;
  }
}

@media screen and (min-width: 750px) {
  :root {
    --size-factor: 6rem;
  }
}

@media screen and (min-width: 1100px) {
  :root {
    --size-factor: 7rem;
  }
}

@media screen and (min-width: 2000px) {
  :root {
    --size-factor: 10rem;
  }
}



            
          
!
            
              class Timepiece {
  constructor() {    
    this.DEFAULT_TRANSITION = this.getDefaultTransition();
    
    this.hourHand = document.querySelector('.hand--hour');
    this.minuteHand = document.querySelector('.hand--minute');
    this.secondHand = document.querySelector('.hand--second');
    
    this.hours = 0;
    this.minutes = 0;
    this.seconds = 0;
    
    this.tick();
    
    window.setInterval(this.tick.bind(this), 1000);
  }
  
  tick() {
    if (this.seconds % 60 === 0) {
      const time = new Date();
      this.hours = time.getHours();
      this.minutes = time.getMinutes();
      this.seconds = 0;
      
      
      // To counteract the counter-clockwise spin transition.
      this.secondHand.style.transition = 'transform 0s linear';
      this.secondHand.style.setProperty('--rotation', this.seconds);
      this.secondHand.style.transition = this.DEFAULT_TRANSITION;
      
    } 
    this.seconds++;
    
    
    if (this.minutes % 60 === 0) {
      this.minuteHand.style.transition = 'transform 0s linear';
      this.minutes = 0;
      this.minuteHand.style.setProperty('--rotation', this.minutes);
      this.minuteHand.style.transition = this.DEFAULT_TRANSITION;
    }
    
    if (this.hours % 12 === 0) {
      this.hourHand.style.transition = 'transform 0s linear';
      this.hours = 0;
      this.hourHand.style.setProperty('--rotation', this.hours);
      this.hourHand.style.transition = this.DEFAULT_TRANSITION;
    }
    
    this.setHours(this.hours, this.minutes);
    this.setMinutes(this.minutes, this.seconds);
    this.setSeconds(this.seconds);
  }
   
  setHours(hours, minutes) {
    const t = ((hours + (minutes / 60)) / 12);
    const degrees = t * 360;
    this.hourHand.style.setProperty('--rotation', `${degrees}deg`);
  }
  
  setMinutes(minutes, seconds) {
    const t = ((minutes + (seconds / 60)) / 60);
    const degrees = t * 360;
    this.minuteHand.style.setProperty('--rotation', `${degrees}deg`);
  }
  
  setSeconds(seconds) {
    const degrees = (seconds / 60) * 360;
    this.secondHand.style.setProperty('--rotation', `${degrees}deg`);
  }
  
  getDefaultTransition() {
    const styles = window.getComputedStyle(document.documentElement);
    return styles.getPropertyValue('--clock-hand-transition');
  }
}

function init() {
  const t = new Timepiece();
}

document.addEventListener('DOMContentLoaded', init, false);
            
          
!
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