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HTML

              
                .output
  #wrapper.wrapper
    #circle.circle
      .counter
        span.text
        img#trophy(alt="trophy" src="data:image/png;base64,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")
    
.input
  pre.code-block
    | .wrapper {
    |   background: #8BC34A
    span.color.orange
    |;
    |   color: #FFFFFF
    span.color.white
    | ;
    textarea#wrapper_code.code(placeholder="Put CSS here" spellcheck="false")
    |     
    | }
  // .circle == .block
  pre.code-block
    | .circle {
    |   background: #424242
    span.color.gray
    | ;
    |   border-radius: 50%;
    textarea#block_code.code(placeholder="Put CSS here" spellcheck="false")
    | 
    | }
              
            
!

CSS

              
                =mq($bp)
  @if $bp == s
    @media (max-width: 500px)
      @content
  @else if $bp == l
    @media (min-width: 1201px)
      @content

$bezier: cubic-bezier(0.175, 0.885, 0.32, 1.275)
$orange: #FF5722
$green: #8BC34A
$gray: #424242
$cross: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAYAAACM/rhtAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAE9JREFUeNrs17ENACAIBEB1WWdiWrRwAy2IuW/oyOUr6JnZHibOnK8WjlY8gICAgICAgICAgKXT98kfGrxs0NMECAgICAgICAgI+C1wCTAAl9UL3o6lLWgAAAAASUVORK5CYII='

p, textarea
  margin: 0
  padding: 0
  
html
  box-sizing: border-box

*, *::after, *::before
  box-sizing: inherit

.output
  width: 100vw
  height: 60vh
  +mq(l)    
    position: absolute
    right: 0
    top: 0
    height: 100vh
    width: 60vw
  &.correct
    #wrapper
      background-position: 50% 50%, 0 0 !important
    #circle
      &::before
        content: "good job!"
        color: $green
      &::after
        opacity: 1
        transform: scale(1)
    .counter    
      opacity: 1
      transform: translate(-50%, 0%)

.input
  width: 100vw
  min-height: 40vh
  display: flex
  padding: 2em 0
  +mq(s)
    min-height: none
    flex-direction: column
  +mq(l)
    flex-direction: column
    justify-content: center
    min-width: 300px
    width: 40vw
    height: 100vh
    padding: 0 2em
    background: white

#wrapper
  width: 100% !important
  height: 100% !important
  background: url($cross) 50% 50% no-repeat, linear-gradient(120deg, $green 50%, $orange 50%) 100% 0 no-repeat !important
  background-size: 40px 40px, 300% 100% !important
  transition: background 0.5s 0.25s !important

#circle
  width: 100px !important
  height: 100px !important
  background: $gray !important
  border-radius: 50% !important
  text-align: center !important
  line-height: 100px !important
  &::before
    content: "center me!"
    position: relative
    z-index: 2
    color: white
    transition: color 0.5s
  &::after
    content: ""
    position: absolute
    left: 0
    top: 0
    z-index: 1
    width: 100%
    height: 100%
    border-radius: 50%
    background: white
    opacity: 0
    transform: scale(0)
    transition: 1s $bezier
.circle
  position: relative
  
.counter
  position: absolute
  bottom: 110%
  left: 50%
  min-width: 200px
  padding: 0.8em 1em
  background: white
  border-radius: 5px
  color: $green
  line-height: 1 !important
  text-align: center
  opacity: 0
  transform: translate(-50%, 50%) scale(1.5, 0.5)
  transition: all 0.5s 0.25s $bezier
  &:after
    content: ""
    position: absolute
    left: 50%
    bottom: -10px
    width: 15px
    height: 15px
    background: inherit
    transform: rotate(45deg) translate(-50%, 0)
    
#trophy
  display: block
  margin: 5px auto 0
  &.silver
    -webkit-filter: grayscale(100%) brightness(1.1)
    filter: grayscale(100%) brightness(1.1)
  &.bronze
    -webkit-filter: hue-rotate(-35deg) contrast(90%) saturate(90%)
    filter: hue-rotate(-35deg) contrast(90%) saturate(90%)
  
.code-block
  flex: 1
  height: 100%
  padding: 0 1em
  margin: 0
  +mq(s)
    height: auto
    flex: none
    &:first-child
      margin-bottom: 2em
  +mq(l)
    height: auto
    flex: none
    padding: 0
    &:first-child
      margin-bottom: 2em
  
.code
  outline: none
  resize: none
  border: 0
  display: block
  height: 6.4em
  width: 100%
  background: #f2f2f2
  padding: 0.2em 1.2em
  transition: 0.5s
  &:focus
    background: #FFECB3

.color
  display: inline-block
  margin: 0 0.2em
  width: 0.8em
  height: 0.8em
  border-radius: 3px
  vertical-align: -0.05em
  &.orange
    background: $orange
  &.gray
    background: $gray
  &.white
    background: white
    border: 1px solid #CCC
              
            
!

JS

              
                $.fn.getCenter = function() {
  let offset = $(this).offset(),
      size = {width: $(this).width(), height: $(this).height()};
  return {
    x: Math.round(size.width / 2 + offset.left),
    y: Math.round(size.height / 2 + offset.top)
  };
};

$.fn.setStyleTo = function($el, cb = null) {
  let val = $(this).val(),
      styles = val.replace(/\n|\s(!important)/ig, "");
  if (typeof cb === "function") cb(val);
  $el.attr("style", styles);
  return this;
};

var center, blockCenter, timer,
    startTime = null;

const $output = $(".output"),
      $wrapperCode = $("#wrapper_code"),
      $blockCode = $("#block_code"),
      $textareas = $("#wrapper_code, #block_code"),
      $wrapper = $(".wrapper"),
      $circle = $(".circle"),
      $counter = $(".counter"),
      $$trophy = document.getElementById("trophy"),
      timeout = 500,
      maxTimer = 120,
      midTimer = 60;
      
const watchTableCellProperty = function(val) {
  if (val.indexOf("table-cell") > -1) {
    $output.css('display', 'table');      
  } else {
    $output.removeAttr('style');
  }
};

const isCenterAligned = (p1, p2) => {
  return Math.abs(p1.x - p2.x) < 2 && Math.abs(p1.y - p2.y) < 2
}

const showSuccess = () => {
  let totalTime = ((new Date() - startTime - timeout) / 1000).toFixed(2);
  if (totalTime > maxTimer) {
    console.log(maxTimer)
    $$trophy.className = "bronze";
  } else if (totalTime > midTimer) {
    $$trophy.className = "silver";
  } else {
    $$trophy.className = "";
  }
  startTime = null;
  $textareas.trigger("blur");
  $output.addClass("correct");
  $counter.find('.text').text(`Completed in ${totalTime}s!`);
};

const syncStyles = () => {
  $wrapperCode.setStyleTo($wrapper, watchTableCellProperty);
  $blockCode.setStyleTo($circle);
  blockCenter = $circle.getCenter();
  center = $wrapper.getCenter();
  if (isCenterAligned(center, blockCenter)) {
    showSuccess();
  }
};

const refreshTimer = (cb) => {
  clearTimeout(timer);
  timer = setTimeout(cb, timeout);
};

const init = () => {
  if (startTime === null) {
    $textareas.val("");
    $output.removeClass("correct");
    $wrapper.removeAttr("style");
    $circle.removeAttr("style");
    startTime = new Date();
  }
}

$textareas.on("input", () => refreshTimer(syncStyles));
$textareas.on("focus", init);
              
            
!
999px

Console