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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

     

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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HTML

            
              <div class="digit hour1">
  <div class="stick one">
    <div class="stick three">
      <div class="stick seven"></div>
    </div>
  </div>
  <div class="stick two">
    <div class="stick four">
      <div class="stick five"></div>
    </div>
  </div>
  <div class="stick six"></div>
</div>

<div class="digit hour2">
  <div class="stick one">
    <div class="stick three">
      <div class="stick seven"></div>
    </div>
  </div>
  <div class="stick two">
    <div class="stick four">
      <div class="stick five"></div>
    </div>
  </div>
  <div class="stick six"></div>
</div>

<div class="colon">:</div>

<div class="digit min1">
  <div class="stick one">
    <div class="stick three">
      <div class="stick seven"></div>
    </div>
  </div>
  <div class="stick two">
    <div class="stick four">
      <div class="stick five"></div>
    </div>
  </div>
  <div class="stick six"></div>
</div>

<div class="digit min2">
  <div class="stick one">
    <div class="stick three">
      <div class="stick seven"></div>
    </div>
  </div>
  <div class="stick two">
    <div class="stick four">
      <div class="stick five"></div>
    </div>
  </div>
  <div class="stick six"></div>
</div>

<div class="sec">
  <div class="digit sec1">
    <div class="stick one">
      <div class="stick three">
        <div class="stick seven"></div>
      </div>
    </div>
    <div class="stick two">
      <div class="stick four">
        <div class="stick five"></div>
      </div>
    </div>
    <div class="stick six"></div>
  </div>

  <div class="digit sec2">
    <div class="stick one">
      <div class="stick three">
        <div class="stick seven"></div>
      </div>
    </div>
    <div class="stick two">
      <div class="stick four">
        <div class="stick five"></div>
      </div>
    </div>
    <div class="stick six"></div>
  </div>
</div>
!

CSS

            
              html {
  height: 100%;
}

body {
  --width: 2vmin;
  --len: 8vmin;
  --color: #4b80ff;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  background: #000;
}

.colon {
  position: relative;
  margin: calc(var(--width) + 1vmin);
}

.colon::before,
.colon::after {
  content: '';
  position: absolute;
  left: 50%;
  transform: translate(-50%, 50%);
  width: var(--width);
  height: var(--width);
  background: var(--color);
}

.colon::before {
  top: calc(0vmin - var(--len) / 2);
}

.colon::after {
  bottom: calc(0vmin - var(--len) / 2);
}

.digit {
  position: relative;
  width: var(--len);
  margin: calc(var(--width) + 1vmin);
}

.sec {
  display: flex;
  margin: var(--len) calc(0vmin - var(--len) * 2) 0 var(--width);
  transform: scale(0.5);
  transform-origin: 0 100%;
}

.stick {
  --half-width: calc(var(--width) / 2);
  --origin-left: calc(0vmin - var(--half-width));
  --origin-right: calc(var(--len) + var(--half-width));
  position: absolute;
  width: var(--len);
  height: var(--width);
  background: var(--color);
  border-radius: 11% / 15%;
  transition: transform 0.4s;
}

.stick::before,
.stick::after {
  content: '';
  position: absolute;
  top: 0;
  border: var(--half-width) solid transparent;
}

.stick::before {
  right: 98%;
  border-right: var(--half-width) solid var(--color);
}

.stick::after {
  left: 98%;
  border-left: var(--half-width) solid var(--color);
}

.stick.one {
  transform-origin: var(--origin-right) 50%;
  transform: rotate(90deg);
}

.stick.two {
  transform-origin: var(--origin-right) 50%;
  transform: rotate(270deg);
}

.stick.three {
  transform-origin: var(--origin-left) 50%;
  transform: rotate(90deg);
}

.stick.four {
  transform-origin: var(--origin-left) 50%;
  transform: rotate(270deg);
}

.stick.five {
  transform-origin: var(--origin-right) 50%;
  transform: rotate(270deg);
}

.stick.six {
  transform-origin: var(--origin-right) 50%;
  transform: rotate(0deg);
}

.stick.seven {
  transform-origin: var(--origin-right) 50%;
  transform: rotate(90deg);
}
!

JS

            
              const sticksByDigits = Array.from(document.querySelectorAll('.digit'))
  .map($d => ['one', 'two', 'three', 'four', 'five', 'six', 'seven']
    .map(i => $d.querySelector(`.stick.${i}`))
  )

const digitMap = [
  [ 90, 270,  90, 270, 270, 90,  90 ],
  [ 90, -90,   0, 360, 360, 90,   0 ],
  [ 90,   0,  90, 450,  90, 90,   0 ],
  [ 90, 270,  90, 270, 360,  0,   0 ],
  [  0, 270, 270, 360, 360, 90,   0 ],
  [  0, 270, 270, 270, 360,  0, 270 ],
  [  0, 270, -90, 270, 270,  0, -90 ],
  [ 90, 270,  90, 360, 360, 90,   0 ],
  [ 90, 270,  90, 270, 270,  0,  90 ],
  [ 90, 270,  90, 360, 360,  0,  90 ],
]

updateTime
setInterval(updateTime, 1000)

function updateTime () {
  const d = new Date()
  const hour = String(d.getHours()).padStart(2, '0')
  const min = String(d.getMinutes()).padStart(2, '0')
  const sec = String(d.getSeconds()).padStart(2, '0')
  setDigit(hour + min + sec)
}

function setDigit (digits) {
  sticksByDigits.forEach(($sticks, iDigit) => {
    const digit = digits[iDigit]
    $sticks.forEach(($stick, iStick) => {
      $stick.style.transform = `rotate(${digitMap[digit][iStick]}deg)`
    })
  })
}
!
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