app-result.js

var app = angular.module('catsvsdogs', []);
var socket = io.connect({transports:['polling']});

var bg1 = document.getElementById('background-stats-1');
var bg2 = document.getElementById('background-stats-2');

app.controller('statsCtrl', function($scope){
  $scope.aPercent = 50;
  $scope.bPercent = 50;

  var updateScores = function(){
    socket.on('scores', function (json) {
       data = JSON.parse(json);
       var a = parseInt(data.a || 0);
       var b = parseInt(data.b || 0);

       var percentages = getPercentages(a, b);

       bg1.style.width = percentages.a + "%";
       bg2.style.width = percentages.b + "%";

       $scope.$apply(function () {
         $scope.aPercent = percentages.a;
         $scope.bPercent = percentages.b;
         $scope.total = a + b;
       });
    });
  };

  var init = function(){
    document.body.style.opacity=1;
    updateScores();
  };
  socket.on('message',function(data){
    init();
  });
});

function getPercentages(a, b) {
  var result = {};

  if (a + b > 0) {
    result.a = Math.round(a / (a + b) * 100);
    result.b = 100 - result.a;
  } else {
    result.a = result.b = 50;
  }

  return result;
}

style-result.css

@import url(//fonts.googleapis.com/css?family=Open+Sans:400,700,600);

*{
  box-sizing:border-box;
}
html,body{
  margin:0;
  padding:0;
  height:100%;
  font-family: 'Open Sans';
}
body{
  opacity:0;
  transition: all 1s linear;
}

.divider{
  height: 150px;
  width:2px;
  background-color: #C0C9CE;
  position: relative;
  top: 50%;
  float: left;
  transform: translateY(-50%);
}

#background-stats-1{
  background-color: #2196f3;
}

#background-stats-2{
  background-color: #00cbca;
}

#content-container{
  z-index:2;
  position:relative;
  margin:0 auto;
  display:table;
  padding:10px;
  max-width:940px;
  height:100%;
}
#content-container-center{
  display:table-cell;
  text-align:center;
  vertical-align:middle;
}
#result{
  z-index: 3;
  position: absolute;
  bottom: 40px;
  right: 20px;
  color: #fff;
  opacity: 0.5;
  font-size: 45px;
  font-weight: 600;
}
#choice{
  transition: all 300ms linear;
  line-height:1.3em;
  background:#fff;
  box-shadow: 10px 0 0 #fff, -10px 0 0 #fff;
  vertical-align:middle;
  font-size:40px;
  font-weight: 600;
  width: 450px;
  height: 200px;
}
#choice a{
  text-decoration:none;
}
#choice a:hover, #choice a:focus{
  outline:0;
  text-decoration:underline;
}

#choice .choice{
  width: 49%;
  position: relative;
  top: 50%;
  transform: translateY(-50%);
  text-align: left;
  padding-left: 50px;
}

#choice .choice .label{
  text-transform: uppercase;
}

#choice .choice.dogs{
  color: #00cbca;
  float: right;
}

#choice .choice.cats{
  color: #2196f3;
  float: left;
}
#background-stats{
  z-index:1;
  height:100%;
  width:100%;
  position:absolute;
}
#background-stats div{
  transition: width 400ms ease-in-out;
  display:inline-block;
  margin-bottom:-4px;
  width:50%;
  height:100%;
}

style-vote.css

@import url(//fonts.googleapis.com/css?family=Open+Sans:400,700,600);

*{
  box-sizing:border-box;
}
html,body{
  margin: 0;
  padding: 0;
  background-color: #F7F8F9;
  height: 100vh;
  font-family: 'Open Sans';
}

button{
  border-radius: 0;
  width: 100%;
  height: 50%;
}

button[type="submit"] {
  -webkit-appearance:none; -webkit-border-radius:0;
}

button i{
  float: right;
  padding-right: 30px;
  margin-top: 3px;
}

button.a{
  background-color: #1aaaf8;
}

button.b{
  background-color: #00cbca;
}

#tip{
  text-align: left;
  color: #c0c9ce;
  font-size: 14px;
}

#hostname{
  position: absolute;
  bottom: 100px;
  right: 0;
  left: 0;
  color: #8f9ea8;
  font-size: 24px;
}

#content-container{
  z-index: 2;
  position: relative;
  margin: 0 auto;
  display: table;
  padding: 10px;
  max-width: 940px;
  height: 100%;
}
#content-container-center{
  display: table-cell;
  text-align: center;
}

#content-container-center h3{
  color: #254356;
}

#choice{
  transition: all 300ms linear;
  line-height: 1.3em;
  display: inline;
  vertical-align: middle;
  font-size: 3em;
}
#choice a{
  text-decoration:none;
}
#choice a:hover, #choice a:focus{
  outline:0;
  text-decoration:underline;
}

#choice button{
  display: block;
  height: 80px;
  width: 330px;
  border: none;
  color: white;
  text-transform: uppercase;
  font-size:18px;
  font-weight: 700;
  margin-top: 10px;
  margin-bottom: 10px;
  text-align: left;
  padding-left: 50px;
}

#choice button.a:hover{
  background-color: #1488c6;
}

#choice button.b:hover{
  background-color: #00a2a1;
}

#choice button.a:focus{
  background-color: #1488c6;
}

#choice button.b:focus{
  background-color: #00a2a1;
}

#background-stats{
  z-index:1;
  height:100%;
  width:100%;
  position:absolute;
}
#background-stats div{
  transition: width 400ms ease-in-out;
  display:inline-block;
  margin-bottom:-4px;
  width:50%;
  height:100%;
}