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HTML

              
                .container
  .header
    %svg#gradient{"style" => "width: auto;"}
      %defs
        %linearGradient#linearGradient{ "x1"=>"0%", "y1"=>"0%", "x2"=>"100%", "y2"=>"100%" }
          %stop{ "offset"=>"0%", "stop-color"=>"#B8D087" }
          %stop{ "offset"=>"100%", "stop-color" =>"#00996D" }
      %text{"y"=>"36px", "fill-opacity"=>"1"}
        Pomodoro Clock
  .timer
    .spinner-container
      .spinner-mask
      %svg.spinner{"width" => "240px", "height" => "240px", "viewBox" => "0 0 66 66", "xmlns" => "http://www.w3.org/2000/svg"}
        %circle.path#spineroo{"fill" => "none", "stroke-width" => ".5", "stroke-cap" => "round", "cx" => "33", "cy" => "33", "r" => "30"}
    .outer-circle
    .inner-circle
    .timer-display
      %svg#gradient
        %defs
          %linearGradient#linearGradient{ "x1" => "0%", "y1" => "0%", "x2" => "100%", "y2" => "100%" }
            %stop{ "offset" => "0%", "stop-color" => "#B8D087" }
            %stop{ "offset" => "100%", "stop-color" =>"#00996D" }
        %text#timer-display-time{"y"=>"36px", "fill-opacity"=>"1"}
          25:00
  #status
  #action-title
    %small SETTINGS
  .actions
    .set-timer
      session length
      .set-display
        %span#set-timer-display 25
        min
      .minus-add
        .setting-button#minus-timer -
        .setting-button#add-timer +
    .set-break
      break length
      .set-display
        %span#set-break-display 5
        min
      .minus-add
        .setting-button#minus-break -
        .setting-button#add-break +
.start#start-timer START
.start#reset-timer.hidden RESET
  
  
              
            
!

CSS

              
                @import url(https://fonts.googleapis.com/css?family=Oxygen|Rubik:300);
$base-font: 'Rubik', Arial, sans-serif;
$base-font-size: 12px;
$white: #DADADB;
$black: #18191d;
$drk-gray: #1F2025;
$lt-gray: #353741;
$lt-green: #B8D087;
$green: #00996D;

@mixin bg-gradient {
  background: linear-gradient(135deg, $lt-green, $green);
}
@mixin shadow {
  box-shadow: 0 16px 28px 0 rgba(0,0,0,.8),0 25px 55px 0 rgba(0,0,0,0.21);
}

html,
body {
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  font-family: $base-font;
  font-size: $base-font-size;
  letter-spacing: $base-font-size/20;
}

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

body {
  @include bg-gradient;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  user-select: none;
}

.hidden {
  display: none;
}

.container {
  @include shadow;
  width: 290px;
  height: 420px;
  background-color: $drk-gray;
  color: $white;
}

.header {
  text-align: center;
  padding: 0 20px 20px 30%;
  font-size: $base-font-size*1.3;
  border-bottom: solid $black 1px;
}

.timer {
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: row;
}

.timer-display {
  color: $lt-green;
  font-size: $base-font-size*3;
  margin-top: 60px;
  margin-left: 10px;
  text-align: center;
}

svg#gradient {
    width: 100px;
    height: 40px;
    vertical-align: bottom;
    pointer-events: none;
    text {
      fill: url(#linearGradient);
    }
}

#status {
  text-align: center;
  height: 20px;
  margin-top: -30px;
  margin-bottom: 30px;
  color: lighten($lt-gray, 20%);
}

.start {
  @include bg-gradient;
  @include shadow;
  width: 290px;
  text-align: center;
  color: white;
  padding: 20px 20px;
  cursor: pointer;
  &:hover {
    background: $green;
  }
  &:active {
    @include bg-gradient;
  }
}

.inner-circle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-48%, -73.5%);
}

.outer-circle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-48%, -73.5%);
  z-index: 1;
}

//progress bar styles
.progress-color0 {
  fill: url(#greenGradient);
}

.progress-color1 {
  fill: $lt-gray;
}

#action-title {
  position: absolute;
  font-size: $base-font-size/1.5;
  left: 50%;
  margin-top: 0;
  transform: translate(-50%,-50%);
  background: $drk-gray;
  padding: 5px 20px;
  border-radius: 20px;
  border: solid lighten($lt-gray, 20%) 1px;
}

.actions {
  display: flex;
  align-items: center;
  text-align: center;
   color: lighten($lt-gray, 20%);
  div {
    
    padding-bottom: 0;
    flex: 1;
  }
}

.set-timer,
.set-break {
  padding-top: 20px;
  border: solid $black 1px;
}

.set-timer {
  border-right: none;
  border-left: none;
}

.set-break {
  border-right: none;
}

.set-display {
  color: $white;
  font-size: $base-font-size*1.4;
  padding-top: 10px;
}
.actions {
  .minus-add {
    font-size: $base-font-size*1.5;
    display: flex;
    padding: 0;
    justify-content: center;
    div {
      cursor: pointer;
      margin: 1px;
      padding:  5px;
      margin-bottom: 10px;
      flex: .5;
      &:hover {
        color: $white;
      }
      &:active {
        color: $lt-gray;
      }
    }
  }  
}

.spinner-container {
  position: absolute;
  z-index: 2;
  left: 50%;
  top: 50%;
  margin-top: -40px;
  transform: translate(-50%, -50%);
}

.spinner-mask {
  position: absolute;
  background-color: $drk-gray;
  height: 45px;
  width: 50px;
  margin-top: 181px;
  left: 200px;
  transform: translate(-50%,-50%);
  z-index: 2;
}

$offset: 187;
$duration: 1.2s;

.spinner {
  transform: rotate(150deg);
  animation: rotator $duration linear infinite;
}

@keyframes rotator {
  0% { transform: rotate(150deg); }
  20% { transform: rotate(200deg); }
  100% { transform: rotate(390deg); }
}

.spinning {
  stroke-dasharray: $offset;
  stroke-dashoffset: 185;
  transform-origin: center;
  animation:
    dash $duration infinite, 
    colors $duration infinite;
}

@keyframes colors {
	0% { stroke: $lt-green; }
	50% { stroke: $green; }
  100% { stroke: $lt-green; }
}

@keyframes dash {
  0% {
    stroke-dashoffset: 185;
  }
  50% {
    stroke-dashoffset: 175;
  }
  100% {
    stroke-dashoffset: 185;
  }
 // 0% { stroke-dashoffset: $offset; }
 // 50% {
 //   stroke-dashoffset: $offset/1.2;
 // }
 // 100% {
 //   stroke-dashoffset: $offset;
 // }
}

              
            
!

JS

              
                //progress bars overlay
const radius = 90,
  padding = 50,
  radians = 2 * Math.PI;

const dimension = (2 * radius) + (2 * padding),
    points = 50, percentage = 0.62;

const angle = d3.scale.linear()
    .domain([0, points-1])
    .range([0, radians]);

const line = d3.svg.line.radial()
    .interpolate("basis")
    .tension(0)
    .radius(radius)
    .angle((d, i) => {
      if(i < (points*percentage +1)) {
        return angle(i);
      }
    });

const svg = d3.select(".outer-circle").append("svg")
    .attr("width", dimension)
    .attr("height", 200)
.append("g");

svg.append("path").datum(d3.range(points))
    .attr("class", "line")
    .attr("fill", "none")
    .attr("stroke-dasharray", "7 3")
    .attr("stroke-width", "25px")
    .attr("stroke", "#1F2025") //#1F2025
    .attr("d", line)
    .attr("transform", "translate(135,106) rotate(-110)");

//progress bars
let elapsedPercent = 0;
const r = 100;
const pi = Math.PI;
const green1 = "#B8D087";
const green2 = "#00996D";
const data = {
  upper: calcPercent(0),
  lower: calcPercent(elapsedPercent)
};
let progress = 0;

function calcPercent(percent) {
  return [percent, 100-percent];
}

const canvas = d3.select(".inner-circle").append("svg")
.attr("height", r + 100)
.attr("width", r + 150);

const group = canvas.append("g")
.attr("transform", "translate("+120+","+110+")");

const arc = d3.svg.arc()
.innerRadius(r/1.2)
.outerRadius(r);

//returns objects based on data
const pie = d3.layout.pie()
.sort(null)
.value(data => data)
.startAngle(-110 * (pi/180))
.endAngle(110 * (pi/180));

const arcs = group.selectAll(".arc")
.data(pie(data.lower))
.enter()
.append("g")
.attr("class", "arc");

const defs = canvas.append("defs")
.append("linearGradient")
.attr("id", "greenGradient")
.attr("gradientUnits", "objectBoundingBox")
.attr("x1", "0")
.attr("y1", "0")
.attr("x2", "1")
.attr("y2", "1")

defs.append("stop").attr("offset", "0%").attr("stop-color", green1);
defs.append("stop").attr("offset", "100%").attr("stop-color", green2);

let path = arcs.append("path")
.attr("class", (data, index) => "progress-color" + index )
.attr("d", arc);

/////////timer
const startButton = document.getElementById("start-timer");
const resetButton = document.getElementById("reset-timer");
const timeDisplay = document.getElementById("timer-display-time");
const statusDisplay = document.getElementById("status");
const spinner = document.getElementById("spineroo");
let sessionTimer = parseInt(document.getElementById("set-timer-display").innerHTML, 10);
let breakTimer = parseInt(document.getElementById("set-break-display").innerHTML, 10);
elapsedPercent = 0;
let seconds = 60;
let minutes;
let timer;
let breakTime = false;

//start timer
startButton.addEventListener('click', () =>{    
  timer = setInterval(timerFn,1000);
  //console.log("button: " + startButton.innerHTML.trim() + " | session: " + sessionTimer + " | break: " + breakTimer);
  startButton.classList.toggle("hidden");
  resetButton.classList.toggle("hidden");
  spinner.classList.toggle("spinning");
  statusDisplay.innerHTML = "In session!";
  minutes = sessionTimer-1;
  function timerFn(){
    seconds--;
    //console.log("time: " +minutes + ":" + seconds + " | percent: " + elapsedPercent);
    progress();
    if (seconds < 10 && minutes < 10) {
      timeDisplay.innerHTML = "0" +minutes + ":0" + seconds;
    }else if(seconds < 10){
      timeDisplay.innerHTML = minutes + ":0" + seconds;
    }else if(minutes < 10){
      timeDisplay.innerHTML = "0" + minutes + ":" + seconds;
    }else{
      timeDisplay.innerHTML = minutes + ":" + seconds;
    }
    if(seconds === 0 && minutes === 0){
      if(breakTime === false){
        breakTime = true;
        minutes = breakTimer-1;
        seconds = 60;
        elapsedPercent = 0;
        statusDisplay.innerHTML = "Take a break!";
        console.log("break time");
      }else{
        breakTime = false;
        minutes = sessionTimer-1;
        seconds = 60;
        elapsedPercent = 0;
        statusDisplay.innerHTML = "In session!";
        console.log("work time");
      }
    }
    if(seconds === 0) {
      minutes--;
      seconds = 60;
    }
  };
  function progress(){   
    let secondsElapsed = minutes*60 + seconds;
    let totalSeconds;
    if(breakTime === true){
      totalSeconds = breakTimer*60;
    }else{
      totalSeconds = sessionTimer*60;
    }
    elapsedPercent = (1 - secondsElapsed/totalSeconds)*100;
    path
    .data(pie(calcPercent(elapsedPercent)))
    .attr("d", arc);
  }
});

//reset timer
resetButton.addEventListener('click', () =>{
  startButton.classList.toggle("hidden");
  resetButton.classList.toggle("hidden");
  spinner.classList.toggle("spinning");
  clearInterval(timer);
  seconds = 60;
  minutes = sessionTimer -1;
  elapsedPercent = 0;
  timeDisplay.innerHTML = sessionTimer + ":00";
  statusDisplay.innerHTML = "Reset!";
  console.log("reset")
  path
    .data(pie(calcPercent(elapsedPercent)))
    .attr("d", arc);
});


//timer settings
const settingOptions = {
  "add-break": ()=>{
    if(breakTimer < 51){
      let timer = breakTimer++;
      document.getElementById("set-break-display").innerHTML = timer + 1;
    }
  },
  "minus-break": ()=>{
    if(breakTimer > 5){
      let timer = breakTimer--;
      document.getElementById("set-break-display").innerHTML = timer - 1;
    }
  },
  "add-timer": ()=>{
    if(sessionTimer < 99){
      let timer = sessionTimer++;
      document.getElementById("set-timer-display").innerHTML = timer + 1;
      document.getElementById("timer-display-time").innerHTML = (timer + 1) + ":00";
    }
  },
  "minus-timer": ()=>{
    if(sessionTimer > 25){
      let timer = sessionTimer--;
      document.getElementById("set-timer-display").innerHTML = timer - 1;
      document.getElementById("timer-display-time").innerHTML = (timer - 1) + ":00";
    }
  }
};

const buttonSettings = document.getElementsByClassName("setting-button");

for(let i = 0; i < buttonSettings.length; i++){
  buttonSettings[i].addEventListener("click", ()=> {
    let operation = buttonSettings[i].getAttribute("id");
    settingOptions[operation]();
    startButton.classList.remove("hidden");
    resetButton.classList.add("hidden");
    spinner.classList.remove("spinning");
    clearInterval(timer);
    seconds = 60;
    minutes = sessionTimer -1;
    elapsedPercent = 0;
    console.log("setting up");
  })
}

              
            
!
999px

Console