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HTML

              
                <div class="Watch">
  <div class="Strap"></div>
  <div class="Screen">
    <div class="Crown"></div>
    <div class="Button"></div>
    <div class="Clock">
      <div class="Chrono"></div>
      <div class="Hand"></div>
      <div class="Hand" size="small"></div>
    </div>
  </div>
  <div class="Strap" reflect="true"></div>
</div>
              
            
!

CSS

              
                :root {
  --light-hue: 260deg;
  --light-saturation: 100%;
  --light-power: 80%;
  
  /* Commend this to disable auto color switch */
  animation: color 20s linear infinite;
}



/* Watch */
.Watch {
  --dimmer: clamp(10%, var(--light-power), 40%);
  --light: var(--light-hue) calc(var(--light-saturation) - 40%) calc(var(--light-power) + 35%); 
  --light-dimmed: var(--light-hue) calc(var(--light-saturation) - 90%) var(--dimmer); 
  --light-dark: var(--light-hue) var(--light-saturation) calc(var(--light-power) / 10); 
  
  filter: drop-shadow(0 10px 50px hsl(0deg 0% 0% / 60%));
}


/* Strap */
.Strap {
  position: relative;
  box-shadow: inset 0 10vmax 2vmax -10vmax hsl(var(--light-hue) 50% 0% / 15%);
  background: 
    linear-gradient(
      to bottom,
      hsl(0deg 0% 100% / 8%),
      hsl(var(--light) / 15%)
    ),
    hsl(var(--light-dark));
  height: 16vmax;
  width: 70%;
  margin: 0 auto;
  z-index: -2;
  border-radius: 50% 50% 0% 0% / 30% 30% 0 0; 
  
  /* Reflect stripe */
  &[reflect="true"] {
    transform: scaleY(-1);
  }
  
  
  /* All straps */
  &::before,
  &::after {
    display: block;
    background: inherit;
    background-size: 100% 200%;
    background-position: 0 100%;
    position: absolute;
    bottom: 0.3vmax;
    width: 12vh;
    height: 9vmax;
    z-index: -1;
    transform: translateY(5px);
    mask-size: 100% 100%;
    mask-position: 0 24px;
    mask-repeat: no-repeat;
  }
  
  /* Top strap */
  &::before {
    right: 99.5%;
    mask-image: radial-gradient(
      ellipse farthest-corner at left top,
      transparent 70%,
      black 70.5%
    );
  }  
  
  /* Bottom strap */
  &::after {
    left: 99.5%;
    mask-image: radial-gradient(
      ellipse farthest-corner at right top,
      transparent 70%,
      black 70.5%
    );
  }
}


/* Screen */
.Screen {  
  --sub-reflection: var(--light-hue) calc(var(--light-saturation) / 5) 60%;
  --screen-color: hsl(var(--light-hue) clamp(0%, var(--light-saturation), 40%) 2%);
  
  position: relative;
  background-color: var(--screen-color);
  display: grid;
  place-items: center;
  width: 38vmax;
  height: 46vmax;
  border: 2px solid #000;
  border-radius: 21% 21% 21% 21% / 20% 20% 20% 20%;
  background-position: center center;
  background-size: 200%;  
  box-shadow:
    25px 0 10px -20px hsl(var(--light) / 60%),
    -25px 0 10px -20px hsl(var(--light) / 60%),
    0 20px 10px -20px hsl(var(--light) / 60%),
    0 -20px 10px -20px hsl(var(--light) / 60%),
    inset 0 125px 3px -125px white,
    inset 0 -125px 3px -125px white,
    inset 125px 0 3px -125px white,
    inset -125px 0 3px -125px white,
    inset 0 50px 5px -50px hsl(var(--light)),
    inset 0 -50px 5px -50px hsl(var(--light)),
    inset 50px 0 5px -50px hsl(var(--light)),
    inset -50px 0 5px -50px hsl(var(--light)),
    inset 0 50px 15px -50px hsl(var(--light)),
    inset 0 -50px 15px -50px hsl(var(--light)),
    inset 50px 0 15px -50px hsl(var(--light)),
    inset -50px 0 15px -50px hsl(var(--light));
  background-image: repeating-conic-gradient(
    hsl(var(--sub-reflection)),
    hsl(var(--sub-reflection) / 7%) 10%,
    hsl(var(--sub-reflection) / 7%) 14%,
    hsl(var(--sub-reflection)) 19%,
    hsl(var(--sub-reflection)) 27%,
    hsl(var(--sub-reflection) / 7%) 25%
  );
  
  /* External frame */
  &::before {
    position: absolute;
    box-shadow:
      inset 0 0.3vmax 0.7vmax -0.4vmax hsl(0deg 0% 0%),
      inset 0 -0.3vmax 0.7vmax -0.4vmax hsl(0deg 0% 0%),
      inset 0 0 0.7vmax 0.6vmax hsl(var(--light-dark));
    left: -5%;
    right: -5%;
    top: -4%;
    bottom: -4%;
    z-index: -1;
    border-radius: 23% 23% 23% 23% / 22% 22% 22% 22%;
    background: 
      repeating-conic-gradient(
        transparent 0%,
        hsl(0deg 0% 0% / 60%) 10%,
        hsl(0deg 0% 0% / 60%) 14%,
        transparent 19%,
        transparent 26%,
        hsl(0deg 0% 0% / 60%) 25%
      ),
      hsl(var(--light-dimmed))
    ;
  }
  
  /* Screen mask */
  &::after {
    position: absolute;
    top: 7%;
    bottom: 2%;
    left: 5%;
    right: 5%;
    border-radius: 15% 15% 23% 23%;
    background:
      linear-gradient(
        to right,
        hsl(var(--light-dimmed) / 20%),
        transparent 40%
      ),
      var(--screen-color)
    ;
    filter: blur(1px);
  }
}


/* Digital Crown */
.Crown {
  position: absolute;
  top: 8vmax;
  left: 103%;
  width: 2.8vmax;
  height: 9vmax;
  border-radius: 20% 20% 20% 20% / 30% 30% 30% 30%;
  box-shadow:
    -0.5vmax 0 0.3vmax -0.1vmax black,
    -1vmax 0 1vmax -0.2vmax hsl(0deg 0% 0% / 60%),
    -0.5vmax 0 0.5vmax -1vmax hsl(var(--light-dark)),
    inset 1px 0 6px 2px hsl(var(--light) / 10%),
    inset 2px 0 6px 5px hsl(0deg 0% 0% / 80%),
    inset -2px 0 2px hsl(var(--light-dark) / 70%);
  background:
    linear-gradient(
      to right,
      hsl(var(--light-dark) / 50%) 10%,
      transparent 40% 70%,
      hsl(var(--light-dimmed) / 60%) 90%
    ),
    repeating-linear-gradient(
      transparent 2% 5%,
      hsl(var(--light-dark) / 50%) 5.1% 9%,
      hsl(var(--light)) 9.1% 9.5%,
      transparent 9.6%
    ),
    linear-gradient(
      to bottom,
      hsl(var(--light)),
      hsl(var(--light) / 30%),
      hsl(var(--light) / 10%),
      hsl(var(--light-dark))
    ),
    hsl(var(--light-dimmed));
  
  /* Crown reflection */
  &::before {
    position: absolute;
    top: 50%;
    left: -55%;
    transform: translateY(-50%);
    width: 20%;
    height: 70%;
    border-radius: 100% 0% 0% 100% / 50% 0% 0% 50%;
    filter: blur(0.15vw);
    opacity: 0.7;
    box-shadow: inset -2px 0 0 1px hsl(var(--light-dark));
    background-color: hsl(0deg 0% 0%);
  }
}


/* Home button */
.Button {
  width: 0.5vw;
  height: 35%;
  position: absolute;
  left: calc(100% + 5%);
  transform: translateX(-100%);
  bottom: 20%;
  border-radius: 100% 0% 0% 100% / 50% 50% 50% 50%;
  box-shadow:
    inset -0.8vmax 0 0 -0.5vmax hsl(var(--light-dark) / 70%),
    -0.1vmax 0 0 0.1vmax hsl(var(--light-dark))
  ;
  background-image: linear-gradient(
    to bottom,
    hsl(var(--light-dimmed)) 5%,
    hsl(var(--light-dark)) 10% 15%,
    hsl(var(--light) / 60%) 20% 70%,
    hsl(var(--light-dark)) 85% 90%,
    hsl(var(--light-dimmed))
  );
}


/* Clock */
.Clock {
  width: 28vmax;
  height: 28vmax;
  position: relative;
  z-index: 1;
  box-sizing: border-box;
  
  &::before {
    position: absolute;
    top: 0;
    left: 0%;
    width: 100%;
    height: 100%;
    border-radius: 100%;
    mask-image: radial-gradient(
      circle at center,
      transparent 66%,
      black 66.1%
    );
    background-image: repeating-conic-gradient(
      white 0 0.25%,
      transparent 0.26% 6.24%,
      white 6.25% 6.25%
    ),
    repeating-conic-gradient(
      hsl(0deg 0% 100% / 20%) 0% 0.25%,
      transparent 0.26% 1.25%,
      hsl(0deg 0% 100% / 20%) 1.25% 1.25%
    )
  }
  
  &::after {
    background-color: white;
    width: 1.3vmax;
    height: 1.3vmax;
    margin-top: -0.65vmax;
    margin-left: -0.65vmax;
    border-radius: 100%;
    position: absolute;
    left: 50%;
    top: 50%;
    mask-image: radial-gradient(
      circle at center,
      transparent 33%,
      black 33.1%
    )
  }
}


/* Clock hands */
.Hand {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  width: 100%;
  padding: 0.5vmax;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  transform-origin: 50% 50%;
  animation: rotation 10s linear infinite;
  
  &::after {
    background-color: white;
    border-radius: 200px;
    width: 11.7vmax;
    height: 1vmax;
    margin-left: -0.3vmax;
  }
  
  &::before {
    background-color: white;
    height: 0.5vmax;
    width: 1.7vmax;
    margin-left: -1.7vmax;
    display: block;
  }
  
  &[size="small"] {
    animation: rotation 30s linear infinite;
  }
  
  &[size="small"]::after {
    width: 6vmax;
    margin-right: 5.5vmax;
  }
}

/* Seconds hand*/
.Chrono {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
  z-index: 2;
  transform-origin: 50% 50%;
  animation: rotation 60s linear infinite;
  animation-timing-function: steps(80, start);
  
  &::before {
    height: 0.29vmax;
    width: 16vmax;
    background-color: orange;
    z-index: 1;
  }
  
  &::after {
    background-color: var(--screen-color);
    box-shadow: 0 0 0 0.2vmax orange;
    width: 0.5vmax;
    height: 0.5vmax;
    margin-top: -0.25vmax;
    margin-left: -0.25vmax;
    border-radius: 100%;
    position: absolute;
    left: 50%;
    top: 50%;
    z-index: 1;
  }
}

/* Hands animation */
@keyframes rotation {
  0% {
    transform: rotate(0deg);
  }
  
  100% {
    transform: rotate(1turn);
  }
}





















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































html {
  block-size: 100%;
  inline-size: 100%;
  background: hsl(var(--light-hue) var(--light-saturation) var(--light-power));
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

body {
  min-block-size: 100%;
  min-inline-size: 100%;
  box-sizing: border-box;
  display: grid;
  margin: 0;
  place-content: center;
  transform: scale(0.8);
}

input {
  margin-block-end: 1rem;
  
  &:last-of-type {
     margin-block-end: 4rem;
  }
}


@keyframes color {
  0% {
    --light-hue: 260deg;
    --light-saturation: 100%;
    --light-power: 80%;
  }
  20% {
    --light-hue: 360deg;
    --light-saturation: 100%;
    --light-power: 50%;
  }
  40% {
    --light-hue: 160deg;
    --light-saturation: 100%;
    --light-power: 80%;
  }
  60% {
    --light-hue: 160deg;
    --light-saturation: 0%;
    --light-power: 0%;
  }
  80% {
    --light-hue: 260deg;
    --light-saturation: 100%;
    --light-power: 80%;
  }
  100% {
    --light-hue: 200deg;
    --light-saturation: 0%;
    --light-power: 100%;
  }
}

*::before,
*::after {
  content: '';
}

@use postcss-preset-env {
  stage: 0;
  preserve: false;
  browsers: [
    "last 1 Chrome versions",
    "last 1 Firefox versions",
    "last 1 Safari versions",
    "last 1 Edge versions"
  ]
}
              
            
!

JS

              
                
              
            
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