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HTML 

              
                <ul>
  <li class="btn-square">Watch1</li>
  <li class="btn">Watch2</li>
  <li class="btn-white">Watch3</li>
</ul>


<article class="watch_square">
<div class="crown "></div>
<div class="base">
  <div id="cssclock">
    <div id="clockanalog">
      <div class="center-circle"></div>
      <div class="hand-second"  id="analogsecond"></div>
     <div class="hand-minute"  id="analogminute"></div>
      <div class="hand-hour"  id="analoghour"></div>
    </div>

  <div class="face">
    <ul>
      <li></li>
      <li></li>
      <li></li> 
      <li></li>
    </ul>
  </div>
</div>
  
  <div class="strap"></div>
</article>
!

CSS 

              
                @import "compass/css3";

*, *:before, *:after {
  box-sizing: border-box;
  transition: 1s;
}

html {
  background: #27ae60; 
}


ul {
 list-style: none;
  
  li {
    color: #fff;
    cursor: pointer;
   font-size: 2em;
    
  }
}


$watch-color: #34495e;
$watch_black-color: #282828;
$watch_white-color: #ecf0f1;

.watch {

.base {
  background: $watch-color;
  border-radius: 50%;
  height: 20em;
  left: 50%;
  margin-left: -10em;
  margin-top: -10em;
  position: absolute;
  top: 50%;

  width: 20em; 
  
  &:after, &:before {
    content: '';
    background-color: #bfbfbf;
    @include filter-gradient(#bfbfbf, #ecf0f1, vertical);
    @include background-image(linear-gradient(top,  #bfbfbf 0%,#ecf0f1 100%));
    border-radius: 50%;
    position: absolute;
    height: 22em;
    left: -1em;
    top: -1em;
    width: 22em;
    z-index: -1; 
  }
  
  &:before {
    box-shadow: -0.2em -0.4em 0.5em rgba(black,0.2);
    height: 24em;
    left: -2em;
    transform: rotate(180deg);
    top: -2em;
    width: 24em; 
  }
}

.face {
  border-radius: 50%;
  height: 100%;
  width: 100%;
  
  ul {
    list-style: none;
    
    li {
      background: $watch-color; 
      border-radius: 50%;
      color: #ecf0f1;
      font-size: 2.8em;
      height: 1.5em;
      line-height: 1.5;
      position: absolute;
      text-align: center;
      text-shadow: 0.05em 0.05em 0.1em rgba(black,0.3);
      width: 1.5em; 
      
      &:first-child {
        top: 0;
        left: 50%;
        margin-left: -0.75em;
        &:after {
          content: '12'; 
        }
      }
      
      &:nth-child(2) {
        margin-top: -0.75em;
        right: 0; 
        top: 50%;
        &:after {
          content: '3'; 
        }
      }
      
      &:nth-child(3) {
        bottom: 0;
        left: 50%;
        margin-left: -0.75em;
        &:after {
          content: '6'; 
        }
      }
      &:nth-child(4) {
        margin-top: -0.75em;
        left: 0; 
        top: 50%;
        &:after {
          content: '9'; 
        }     
      }
    }
  }
  
  &:after {
    content: '';
    @include background-image(linear-gradient(left bottom,  rgba(255,255,255,0) 0%,rgba(255,255,255,0) 60%,rgba(255,255,255,0.1) 60%));
    box-shadow: inset 0.5em 1em 2em rgba(black,0.3),inset -0.5em -1em 2em rgba(white,0.1);
    border-radius: 50%;
    position: absolute;
    height: 20em;
    left: 0;
    top: 0;
    width: 20em;
    z-index: 5;
  }
  
  &:before {
    border-radius: 50%;
    border: 0.25em solid #ecf0f1;
    box-shadow: 
      0.05em 0.05em 0.1em rgba(black,0.9),
      inset 0.05em 0.05em 0.1em rgba(white,0.3),
      inset -0.05em -0.05em 0.1em rgba(black,0.9),
      -0.05em -0.05em 0.1em rgba(white,0.3);
    content: '';
    height: 80%;
    left: 9.5%; 
    position: absolute;
    top: 9.5%;
    width: 80%;
  }
  
}
.crown {
  background-color: gray;
  background-image: linear-gradient(transparent 50%, rgba(255,255,255,.5) 50%);
  background-size: 6px 6px; 
  border-radius: 0.2em;
  height: 2em;
  left: 50%;
  margin-left: 12em;
  margin-top: -1em;
  position: absolute;
  top: 50%;
  width: 1em; 
}


.strap {
  background-color: #282828;
  border-left: 0.2em dashed rgba(white,0.2);
  border-right: 0.2em dashed rgba(white,0.2);
  box-shadow: 
    -0.3em 0 #282828,
    0.3em 0 #282828,
    -0.4em -0.6em 0.5em rgba(black,0.2),
    0.4em 0.6em 0.5em rgba(black,0.2);
  height: 100%;
  margin-left: -6em;
  left: 50%;
  position: fixed;
  top: 0;
  width: 12em;
  z-index: -3;
}

[class*="hand-"] {
  background: #bfbfbf;
  border-radius: 0.4em 0.4em 0 0;
  box-shadow: 0 0 0.5em rgba(black,0.2);
  left: 9.8em;
  position: absolute;
  top: 2em;
  z-index: 4;
  transform-origin: 50% 100%  ; 
}

.hand-second {
  width: 0.2em;
  top: 0.1em;
  height: 10em; 
}

.hand-minute {
  width: 0.4em;
  top: 2.1em;
  height: 8em; 
}

.hand-hour {
  width: 0.6em;
  top: 4em;
  height: 6em; 
}
.center-circle {
  background: #ecf0f1;
  box-shadow: 0 0 0.1em rgba(black,0.4);
  border-radius: 50%;
  height: 1.5em;
  left: 50%;
  margin-left: -0.75em;
  margin-top: -0.75em;
  position: absolute;
  top: 50%;
  width: 1.5em; 
  z-index: 5;
  
  &:after {
    background: #7f8c8d;
    border-radius: 50%;
    content: '';
    height: 0.9em;
    left: 0.3em;
    position: absolute;
    top: 0.3em;
    width: 0.9em;
  }
}

}


// watch_square 
.watch_square {

 
.base {
  background: $watch_black-color;
  border-radius: 2em; 
  height: 20em;
  left: 50%;
  margin-left: -10em;
  margin-top: -10em;
  position: absolute;
  top: 50%;
  width: 20em; 
  
  &:after, &:before {
    content: '';
    background-color: #000000;
    @include filter-gradient(#000000, #45484d, vertical);
    @include background-image(linear-gradient(top,  #000000 0%,#45484d 100%));
    border-radius:2em;
    position: absolute;
    height: 20.5em;
    left: -0.25em;
    top: -0.25em;
    width: 20.5em;
    z-index: -1; 
  }
  
  &:before {
    box-shadow: -0.2em -0.4em 0.5em rgba(black,0.2);
    height: 22em;
    left: -1em;
    transform: rotate(180deg);
    top: -1em;
    width: 22em; 
  }
}


.crown {
  background-color: black;
  background-image: linear-gradient(transparent 50%, rgba(255,255,255,.2) 50%);
  background-size: 6px 6px; 
  border-radius: 0.2em;
  height: 2em;
  left: 50%;
  margin-left: 10.9em;
  margin-top: -1em;
  position: absolute;
  top: 50%;
  width: 1em; 
}




.face {
  border-radius: 50%;
  height: 100%;
  width: 100%;
  
  ul {
    list-style: none;
    
    li {
      background: $watch_black-color; 
      border-radius: 50%;
      color: #ecf0f1;
      font-size: 2.8em;
      height: 1.5em;
      line-height: 1.5;
      position: absolute;
      text-align: center;
      text-shadow: 0.05em 0.05em 0.1em rgba(black,0.3);
      width: 1.5em; 
      
      &:first-child {
        top: 0;
        left: 50%;
        margin-left: -0.75em;
        &:after {
          content: '|'; 
        }
      }
      
      &:nth-child(2) {
        margin-top: -0.75em;
        right: 0; 
        top: 50%;
        transform: rotate(90deg);
        &:after {
          content: '|';
        }
      }
      
      &:nth-child(3) {
        bottom: 0;
        left: 50%;
        margin-left: -0.75em;
        &:after {
          content: '|'; 
        }
      }
      &:nth-child(4) {
        margin-top: -0.75em;
        left: 0; 
        top: 50%;
        transform: rotate(90deg);
        &:after {
          content: '|'; 
        }
      }      
      
    }
  }
  
  &:after {
    content: '';
    @include background-image(linear-gradient(left bottom,  rgba(255,255,255,0) 0%,rgba(255,255,255,0) 60%,rgba(255,255,255,0.1) 60%));
    box-shadow: inset 0.5em 1em 2em rgba(black,0.3),inset -0.5em -1em 2em rgba(white,0.1);
    border-radius: 50%;
    position: absolute;
    height: 20em;
    left: 0;
    top: 0;
    width: 20em;
    z-index: 5;
  }
  
  &:before {
    border-radius: 50%;
    border: 2em solid #202020;
    box-shadow: 
      0.05em 0.05em 0.1em rgba(black,0.9),
      inset 0.05em 0.05em 0.1em rgba(white,0.3),
      inset -0.05em -0.05em 0.1em rgba(black,0.9),
      -0.05em -0.05em 0.1em rgba(white,0.3);
    content: '';
    height: 50%;
    left: 25%; 
    position: absolute;
    top: 25%;
    width: 50%; 
  } 
  
}

.strap {
  background-color: #282828;
  border-left: none;
  border-right: none;
  box-shadow: 
    inset  -0.4em 0 0.3em rgba(white,0.05),
    inset 0.4em 0 0.3em rgba(white,0.05), 
    -0.4em -0.6em 0.5em rgba(black,0.2),
    0.4em 0.6em 0.5em rgba(black,0.2);
  height: 100%;
  margin-left: -6em;
  left: 50%;
  position: fixed;
  top: 0;
  width: 12em;
  z-index: -3;
}



[class*="hand-"] {
  background-color: #bfbfbf;
  border-radius: 0; 
  
  left: 9.8em;
  position: absolute;
  top: 2em;
  z-index: 4;
  transform-origin: 50% 100%  ; 
}

.hand-second {
  background: #a90000;
  width: 0.2em;
  top: 0.1em;
  height: 10em; 
}

.hand-minute {
  width: 0.4em;
  top: 2.1em;
  height: 8em; 
}

.hand-hour {
  width: 0.6em;
  top: 4em;
  height: 6em; 
}
.center-circle {
  background: #ecf0f1;
  box-shadow: 0 0 0.1em rgba(black,0.4);
  border-radius: 0.5em;
  height: 1.5em;
  left: 50%;
  margin-left: -0.75em;
  margin-top: -0.75em;
  position: absolute;
  top: 50%;
  width: 1.5em; 
  z-index: 5;
  
  &:after {
    background: #7f8c8d;
    border-radius: 50%;
    content: '';
    height: 0.9em;
    left: 0.3em;
    position: absolute;
    top: 0.3em;
    width: 0.9em;
  }
}

}


// Watch_white 
.watch_white {

 
.base {
  background: $watch_white-color;
  border-radius: 50%; 
  height: 20em;
  left: 50%;
  margin-left: -10em;
  margin-top: -10em;
  position: absolute;
  top: 50%;
  width: 20em; 
  
  &:after, &:before {
    content: '';
background-color: rgb(255,255,255);
@include filter-gradient(#ffffff, #ffffff, vertical);
@include background-image(linear-gradient(top,  rgba(255,255,255,1) 0%,rgba(243,243,243,1) 50%,rgba(237,237,237,1) 51%,rgba(255,255,255,1) 100%));
    border-radius: 50%;
    position: absolute;
    height: 20.5em;
    left: -0.25em;
    top: -0.25em;
    width: 20.5em;
    z-index: -1; 
  }
  
  &:before {
    box-shadow: -0.2em -0.4em 0.5em rgba(black,0.2);
    height: 22em;
    left: -1em;
    transform: rotate(180deg);
    top: -1em;
    width: 22em; 
  }
}


.crown {
  background-color: black;
  background-image: linear-gradient(transparent 50%, rgba(255,255,255,.2) 50%);
  background-size: 6px 6px; 
  border-radius: 0.2em;
  height: 2em;
  left: 50%;
  margin-left: 10.9em;
  margin-top: -1em;
  position: absolute;
  top: 50%;
  width: 1em; 
}




.face {
  border-radius: 50%;
  height: 100%;
  width: 100%;
  
  ul {
    list-style: none;
    
    li {
      background: $watch_white-color; 
      border-radius: 50%;
      color: #ecf0f1;
      font-size: 2.8em;
      height: 1.5em;
      line-height: 1.5;
      position: absolute;
      text-align: center;
      text-shadow: 0.05em 0.05em 0.1em rgba(black,0.3);
      width: 1.5em; 
      
      &:first-child {
        top: 0;
        left: 50%;
        margin-left: -0.75em;
        &:after {
          content: 'XII'; 
        }
      }
      
      &:nth-child(2) {
        margin-top: -0.75em;
        right: 0; 
        top: 50%;
        &:after {
          content: 'III';
        }
      }
      
      &:nth-child(3) {
        bottom: 0;
        left: 50%;
        margin-left: -0.75em;
        &:after {
          content: 'V|'; 
        }
      }
      &:nth-child(4) {
        margin-top: -0.75em;
        left: 0; 
        top: 50%;
        &:after {
          content: '|X'; 
        }
      }      
      
    }
  }
  
  &:after {
    content: '';
    @include background-image(linear-gradient(left bottom,  rgba(255,255,255,0) 0%,rgba(255,255,255,0) 60%,rgba(255,255,255,0.1) 60%));
    box-shadow: inset 0.5em 1em 2em rgba(black,0.3),inset -0.5em -1em 2em rgba(white,0.1);
    border-radius: 50%;
    position: absolute;
    height: 20em;
    left: 0;
    top: 0;
    width: 20em;
    z-index: 5;
  }
  
  &:before {
    border-radius: 50%;
    border: 2em solid #ccc;
    box-shadow: 
      0.05em 0.05em 0.1em rgba(black,0.9),
      inset 0.05em 0.05em 0.1em rgba(white,0.3),
      inset -0.05em -0.05em 0.1em rgba(black,0.9),
      -0.05em -0.05em 0.1em rgba(white,0.3);
    content: '';
    height: 50%;
    left: 25%; 
    position: absolute;
    top: 25%;
    width: 50%; 
  } 
  
}

.strap {
  background-color: #282828;
  border-left: none;
  border-right: none;
  box-shadow: 
    inset  -0.4em 0 0.3em rgba(white,0.05),
    inset 0.4em 0 0.3em rgba(white,0.05), 
    -0.4em -0.6em 0.5em rgba(black,0.2),
    0.4em 0.6em 0.5em rgba(black,0.2);
  height: 100%;
  margin-left: -6em;
  left: 50%;
  position: fixed;
  top: 0;
  width: 12em;
  z-index: -3;
}



[class*="hand-"] {
  background-color: #444;
  border-radius: 0; 
  
  left: 9.8em;
  position: absolute;
  top: 2em;
  z-index: 4;
  transform-origin: 50% 100%  ; 
}

.hand-second {
  width: 0.2em;
  top: 0.1em;
  height: 10em; 
}

.hand-minute {
  width: 0.4em;
  top: 2.1em;
  height: 8em; 
}

.hand-hour {
  width: 0.6em;
  top: 4em;
  height: 6em; 
}
.center-circle {
  background: #ecf0f1;
  box-shadow: 0 0 0.1em rgba(black,0.4);
  border-radius: 50%;
  height: 1.5em;
  left: 50%;
  margin-left: -0.75em;
  margin-top: -0.75em;
  position: absolute;
  top: 50%;
  width: 1.5em; 
  z-index: 5;
  
  &:after {
    background: #7f8c8d;
    border-radius: 50%;
    content: '';
    height: 0.9em;
    left: 0.3em;
    position: absolute;
    top: 0.3em;
    width: 0.9em;
  }
}

}
!

JS 

              
                $('.btn-square').click(function() {
   $('article').removeAttr('class');
  $('html').css("background","#27ae60");
  $('article').addClass('watch_square');
});

$('.btn').click(function() {
   $('article').removeAttr('class');
  $('html').css("background","#2980b9");
  $('article').addClass('watch');
});


$('.btn-white').click(function() {
   $('article').removeAttr('class');
  $('article').addClass('watch_white');
  $('html').css("background","#8e44ad");
});
/* I didn't write the JS for the clock workings, the script is from here:
*  http://joncom.be/code/css-clocks/
*/
var oClockAnalog = {
    aSecond:         [],
    dtDate:          new Date(),
    iCurrSecond:     -1,
    iHourRotation:   -1,
    iMinuteRotation: -1,
    iStepSize:       10,
    iTimerAnimate:   setInterval("oClockAnalog.fAnimate()", 20),
    iTimerUpdate:    setInterval("oClockAnalog.fUpdate()", 1000),

    fAnimate:       function() {
        if (this.aSecond.length > 0) {
            this.fRotate("analogsecond", this.aSecond[0]);
            this.aSecond = this.aSecond.slice(1);
        }
    },
    fGetHour:     function() {
        var iHours = this.dtDate.getHours();
        if (iHours > 11) {
            iHours -= 12;
        }
        return Math.round((this.dtDate.getHours() * 30) + (this.dtDate.getMinutes() / 2) + (this.dtDate.getSeconds() / 120));
    },
    fGetMinute:     function() {
        return Math.round((this.dtDate.getMinutes() * 6) + (this.dtDate.getSeconds() / 10));
    },
    fInit:          function() {
        this.iHourRotation = this.fGetHour();
        this.fRotate("analoghour", this.iHourRotation);

        this.iMinuteRotation = this.fGetMinute();
        this.fRotate("analogminute", this.iMinuteRotation);

        this.iCurrSecond = this.dtDate.getSeconds();
        this.fRotate("analogsecond", (6 * this.iCurrSecond));
    },
    fRotate:        function(sID, iDeg) {
        var sCSS = ("rotate(" + iDeg + "deg)");
        $("#" + sID).css({ '-moz-transform': sCSS, '-o-transform': sCSS, '-webkit-transform': sCSS });
    },
    fStepSize:     function(iTo, iFrom) {
        var iAnimDiff = (iFrom - iTo);
        if (iAnimDiff > 0) {
            iAnimDiff -= 360;
        }
        return iAnimDiff / this.iStepSize;
    },
    fUpdate:        function() {
        // update time
        this.dtDate = new Date();

        // hours
        var iTemp = this.fGetHour();
        if (this.iHourRotation != iTemp) {
            this.iHourRotation = iTemp;
            this.fRotate("analoghour", iTemp);
        }

        // minutes
        iTemp = this.fGetMinute();
        if (this.iMinuteRotation != iTemp) {
            this.iMinuteRotation = iTemp;
            this.fRotate("analogminute", iTemp);
        }

        // seconds
        if (this.iCurrSecond != this.dtDate.getSeconds()) {
            var iRotateFrom = (6 * this.iCurrSecond);
            this.iCurrSecond = this.dtDate.getSeconds();
            var iRotateTo = (6 * this.iCurrSecond);

            // push steps into array
            var iDiff = this.fStepSize(iRotateTo, iRotateFrom);
            for (var i = 0; i < this.iStepSize; i++) {
                iRotateFrom -= iDiff;
                this.aSecond.push(Math.round(iRotateFrom));
            }
        }
    }
};   ClockInit();
!
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Console