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HTML 

              
                <link href="https://fonts.googleapis.com/css?family=Lato:100,300,400,700" rel="stylesheet">
<div ng-app="calculatorApp">
<div class="main-container" >
  
			<div class="bg-image"></div>
			<div class="calculator-container" ng-controller="calculatorCtrl">
				<div class="display-container">
				  <h1 ng-class="{ 'hide-result' : hideResult, 'medium-size' : result>9999999, 'small-size' : result>999999999, 'smallest-size': result>9999999999999, 'infinity-size': result==1/0 }" >{{ result | number }}</h1>
				  <h2 ng-class="{error : errorCounter>1, centered : firstTime, 'tracking-in-expand': firstTime}">{{ expression }}</h2>
				</div>

				<div class="keys-container noselect">
					<div class="back-rectangle scale-up-center3"></div>
					<div class="number-leaves-container scale-up-center1">
					    <div class="leaf-corner leaf-1" ng-click="handleClick('1')"><h3>1</h3></div>
					    <div class="leaf leaf-2" ng-click="handleClick('2')"><h3>2</h3></div>
					    <div class="leaf-corner leaf-3" ng-click="handleClick('3')"><h3>3</h3></div>
					    <div class="leaf leaf-4" ng-click="handleClick('4')"><h3>4</h3></div>
					    <div class="leaf leaf-6" ng-click="handleClick('6')"><h3>6</h3></div>
					    <div class="leaf-corner leaf-7" ng-click="handleClick('7')"><h3>7</h3></div>
					    <div class="leaf leaf-8" ng-click="handleClick('8')"><h3>8</h3></div>
					    <div class="leaf-corner leaf-9" ng-click="handleClick('9')"><h3>9</h3></div>
					    <div class="leaf leaf-5" ng-click="handleClick('5')"><h3>5</h3></div>
					    
					    <div class="operations-leaves-container1 scale-up-center2">
					      <div class="leaf-corner leaf-1" ng-click="handleClick('-')"><h3 class="minus">–</h3></div>
					      <div class="leaf-corner leaf-3" ng-click="handleClick('.')"><h3 class="period">.</h3></div>
					      <div class="leaf-corner leaf-7" ng-click="clear(true)"><h3 class="ac">AC</h3></div>
					      <div class="leaf-corner leaf-9" ng-click="handleClick('*')"><h3 class="multiply">x</h3></div>
					      
					      <div class="operations-leaves-container2">
					        <div class="leaf-corner leaf-1" ng-click="handleClick('0')"><h3 class="zero">0</h3></div>
					        <div class="leaf-corner leaf-3" ng-click="handleClick('+')"><h3 class="plus">+</h3></div>
					        <div class="leaf-corner leaf-7" ng-click="handleClick('/')"><h3 class="divide">÷</h3></div>
					        <div class="leaf-corner leaf-9" ng-click="clear(false)"><h3 class="percent">C</h3></div>
					      </div>
					    </div>
					</div>
				</div>
			</div>
		</div>

		<div class="show-info-button" title="View Information" ng-init="showInfo=false" ng-hide="showInfo" ng-click="showInfo = !showInfo">Info</div>

	    <div class="info-container" ng-class="{'shown-item': showInfo}">
			<div class="info-panel">
				<img src="https://wansoul.github.io/LotusCalculator/favicons/android-chrome-192x192.png" class="icon" />
				<h1>Lotus Calculator</h1>
				<h2>Calculator inspired by Lotus Flower</h2>
				<p>I made the concept of this calculator as part of the DailyUI Design Challenge. I liked it so much and decided to code and make it work as a web app.</p>
				<p>Check the project on my <a href="https://github.com/wansoul/LotusCalculator" title="See the source code on Github" target="-blank">Github</a>.</p>
				<hr/>
				<div class="contact-info-container">
					<img src="https://wansoul.github.io/LotusCalculator/assets/avatar.jpg" class="avatar" />
					<h3>Wan Souza</h3>
					<h4>UX/UI Designer</h4>
					<div class="social-icons">
						<a href="https://www.behance.net/wansouza" title="Behance" class="behance" target="_blank">Behance</a>
						<a href="https://www.linkedin.com/in/wansouza" title="LinkedIn" class="linkedin" target="_blank">LinkedIn</a>
						<a href="https://github.com/wansoul" title="Github" class="github" target="_blank">Github</a>
						<a href="https://twitter.com/wansoul" title="Twitter" class="twitter" target="_blank">Twitter</a>
					</div>
				</div>
				<div class="close-button" title="Close this panel" ng-click="showInfo = !showInfo" >Close</div>
			</div>
	    </div>
</div>
!

CSS 

              
                * {
  -webkit-backface-visibility: hidden;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
}
body {
  background-color: #000;
  font-family: 'lato';
  margin: 0;
  overflow: hidden;
}
h3 {
  font-size: 28px;
  font-weight: 700;
  opacity: 0.8;
}
.noselect {
  -webkit-touch-callout: none;
  /* iOS Safari */
  -webkit-user-select: none;
  /* Safari */
  -khtml-user-select: none;
  /* Konqueror HTML */
  -moz-user-select: none;
  /* Firefox */
  -ms-user-select: none;
  /* Internet Explorer/Edge */
  user-select: none;
  /* Non-prefixed version, currently
  supported by Chrome and Opera */
}

.info-container{
  position: absolute; z-index: 12;
  left: 0; top: 0;
  width: 100%; height: 100%;
  opacity: 0;
  transform: translateY(600px);
  transition: all 0.3s ease-in-out;
}
.shown-item{
  opacity: 1;
  transform: translateY(0px);
}

.info-panel{
  position: relative;
  width: 90%; height: 440px;
  min-width: 280px;
  max-width: 300px;
  top: 15%;
  margin: 0 auto;
  background-color: rgb(236, 241, 230);
  text-align: center;
  border-radius: 10px;
}

.info-panel > .icon{
  width: 110px; height: 110px;
  padding: 4px;
  background-color: #fff;
  box-shadow: 0 0 8px rgba(0,0,0,.3);
  border-radius: 10px;
  margin-top: -55px;
}

.info-panel > h1{
  font-weight: 400;
  font-size: 32px;
  margin-bottom: 4px;
  margin-top: 12px;
}
.info-panel > h2{
  font-weight: 400;
  width: 90%;
  font-size: 16px;
  opacity: .6;
  margin: 6px auto 16px auto;
}

.show-info-button,
.info-panel > .close-button{
  position: absolute;
  width: 32px; height: 32px;
  right: 12px; top: 12px;
  display: block;
  cursor: pointer;
  overflow: hidden;
  text-indent: 300px;
  opacity: 0.6;
  z-index: 15;
}
.close-button{
  background: url(https://wansoul.github.io/LotusCalculator/assets/close.svg);
  background-size: cover;
}
.show-info-button{
  background: url(https://wansoul.github.io/LotusCalculator/assets/info.svg);
  background-size: cover;
}
.show-info-button:hover,
.info-panel > .close-button:hover{
  opacity: .9;
  transform: scale(1.2);
}

.info-panel > p{
  width: 90%;
  text-align: left;
  margin-left: auto;
  margin-right: auto; 
  font-weight: 300;
}

/*## CONTACT INFO ####*/
.contact-info-container{
  width: 90%;
  margin: 0 auto;
}
.contact-info-container > h3{
  font-size: 24px;
  text-align: left;
  margin-top: 16px;
  font-weight: 400;
  margin-bottom: 0;
}
.contact-info-container > h4{
  font-size: 16px;
  font-weight: 300;
  text-align: left;
  margin-top: 4px; 
  margin-bottom: 4px;
}
.avatar{
  float: left;
  margin-right: 12px;
  width: 72px;
  height: 72px;
  border-radius: 50%;
}

.social-icons{
  text-align: left;
}
.social-icons > a{
  width: 32px; height: 32px;
  display: inline-block;
  background: url(https://wansoul.github.io/LotusCalculator/assets/behance.svg) no-repeat center;
  overflow: hidden;
  text-indent: 100px;
  margin-right: 4px;
}
.social-icons > a:hover{
  transform: scale(1.2);
}
.social-icons > a.behance{
  margin-left: -4px;
}
.social-icons > a.linkedin{
  background-image: url(https://wansoul.github.io/LotusCalculator/assets/linkedin.svg)
}
.social-icons > a.github{
  background-image: url(https://wansoul.github.io/LotusCalculator/assets/github.svg)
}
.social-icons > a.twitter{
  background-image: url(https://wansoul.github.io/LotusCalculator/assets/twitter.svg)
}


/*## BG IMAGE ####*/
.bg-image {
  position: absolute;
  width: 100vw;
  height: 100vh;
  background: url(https://wansoul.github.io/LotusCalculator/assets/bg.jpg);
  background-size: cover;
  z-index: 0;
}
.blur {
  -webkit-filter: blur(10px);
  -moz-filter: blur(10px);
  -o-filter: blur(10px);
  -ms-filter: blur(10px);
  filter: blur(10px);
}


/*## MAIN VONTAINER ####*/
.main-container {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background-color: rgba(0, 0, 0, 0.8);
  z-index: 1;
}
.calculator-container {
  position: relative;
  margin: 0 auto;
  top: 20vh;
  width: 254px;
  height: 380px;
  z-index: 1;
}
.display-container {
  position: relative;
  width: 90%;
  height: 120px;
  margin: 0 auto;
}
.display-container h1,
.display-container h2 {
  right: 0;
  min-width: 100%;
  position: absolute;
  color: #fff;
  margin: 0 auto;
  padding: 0;
}
.display-container h1 {
  height: 69px;
  font-weight: 100;
  font-size: 58px;
  line-height: 69px;
  text-align: right;
  margin-top: -8px;
  transition: all 0.2s ease-in;
}
.display-container h2 {
  top: 70px;
  text-align: right;
  font-weight: 300;
  font-size: 21px;
  opacity: 0.75;
}
.keys-container {
  position: relative;
  width: 100%;
  height: 254px;
  margin: 0 auto;
}
.back-rectangle {
  position: absolute;
  width: 177px;
  height: 177px;
  left: 40px;
  top: 40px;
  transform: rotate(45deg);
  background-color: #7F0026;
  opacity: 0.5;
}
.number-leaves-container {
  position: absolute;
  width: 204px;
  height: 204px;
  margin: 24px;
  z-index: 3;
}
.leaf {
  position: absolute;
  width: 64px;
  height: 64px;
  cursor: pointer;
  background-color: #D90845;
  color: #fff;
  box-shadow: 0 0 8px 0 rgba(72, 3, 23, 0.62);
  z-index: 6;
  font-size: 28px;
  transition: transform 0.07s ease-in-out;
}
.leaf:hover {
  background-color: #F50049;
  transform: scaleX(1.1) scaleY(1.1) rotate(45deg);
}
.leaf h3 {
  display: block;
  margin: 20% 35%;
  z-index: 10;
}
.leaf-corner {
  position: absolute;
  width: 70px;
  height: 70px;
  cursor: pointer;
  background-color: #D90845;
  color: #fff;
  box-shadow: 0 0 8px 0 rgba(72, 3, 23, 0.62);
  z-index: 5;
  transition: transform 0.1s ease-in-out;
}
.leaf-corner:hover {
  background-color: #F50049;
  transform: scaleX(1.1) scaleY(1.1);
}
.leaf-corner h3 {
  display: block;
  cursor: pointer;
  z-index: 10;
}
.leaf-5 {
  left: 70px;
  top: 70px;
  border-radius: 50%;
  transform: rotate(45deg);
}
.leaf-5 h3 {
  transform: rotate(-45deg);
}
.leaf-6 {
  left: 130px;
  top: 70px;
  border-radius: 50% 0 50% 50%;
  transform: rotate(45deg);
}
.leaf-6 h3 {
  transform: rotate(-45deg);
}
.leaf-4 {
  left: 12px;
  top: 70px;
  border-radius: 50% 50% 50% 0;
  transform: rotate(45deg);
}
.leaf-4 h3 {
  transform: rotate(-45deg);
}
.leaf-2 {
  left: 70px;
  top: 128px;
  border-radius: 50% 50% 0 50%;
  transform: rotate(45deg);
}
.leaf-2 h3 {
  transform: rotate(-45deg);
}
.leaf-8 {
  left: 70px;
  top: 12px;
  border-radius: 0 50% 50% 50%;
  transform: rotate(45deg);
}
.leaf-8 h3 {
  transform: rotate(-45deg);
}
.leaf-9 {
  left: 110px;
  top: 24px;
  border-radius: 50% 0 50% 50%;
}
.leaf-9 h3 {
  margin: 3% 62%;
}
.leaf-1 {
  left: 24px;
  top: 110px;
  border-radius: 50% 50% 50% 0;
}
.leaf-1 h3 {
  margin: 43% 20%;
}
.leaf-3 {
  left: 110px;
  top: 110px;
  border-radius: 50% 50% 0 50%;
}
.leaf-3 h3 {
  margin: 46% 60%;
}
.leaf-7 {
  left: 24px;
  top: 24px;
  border-radius: 0 50% 50% 50%;
}
.leaf-7 h3 {
  margin: 3% 20%;
}
.operations-leaves-container1 {
  position: absolute;
  width: 100%;
  height: 100%;
  transform: rotate(23deg) scaleX(1.2) scaleY(1.2);
  z-index: 2;
}
.operations-leaves-container1 .leaf-corner {
  background-color: #A60031;
}
.operations-leaves-container1 .leaf-corner:hover {
  background-color: #DC0041;
}
.operations-leaves-container1 h3 {
  font-size: 21px;
  font-weight: 400;
  transform: rotate(-23deg);
}
.operations-leaves-container1 h3.minus {
  margin: 45% 12%;
}
.operations-leaves-container1 h3.period {
  font-size: 30px;
  margin: 44% 68%;
}
.operations-leaves-container1 h3.ac {
  font-size: 18px;
  margin: -1% 6%;
}
.operations-leaves-container1 h3.multiply {
  font-size: 19px;
  margin: 7% 69%;
}
.operations-leaves-container2 {
  position: absolute;
  width: 100%;
  height: 100%;
  transform: rotate(-46deg);
  z-index: 1;
}
.operations-leaves-container2 h3 {
  font-size: 21px;
  font-weight: 400;
  transform: rotate(23deg);
}
.operations-leaves-container2 h3.zero {
  margin: 68% 13%;
}
.operations-leaves-container2 h3.plus {
  margin: 55% 66%;
}
.operations-leaves-container2 h3.divide {
  margin: 16% 14%;
}
.operations-leaves-container2 h3.percent {
  font-size: 18px;
  margin: 6% 66%;
}
h2.error {
  color: #F33535;
  font-weight: 700;
  -webkit-animation: shake-right 0.7s cubic-bezier(0.455, 0.03, 0.515, 0.955) both;
  -moz-animation: shake-right 0.7s cubic-bezier(0.455, 0.03, 0.515, 0.955) both;
  animation: shake-right 0.7s cubic-bezier(0.455, 0.03, 0.515, 0.955) both;
}
h2.centered {
  text-align: center;
  opacity: .9;
}
h1.hide-result {
  transform: translateY(20px);
  opacity: 0;
}
h1.medium-size {
  font-size: 42px;
}
h1.small-size {
  font-size: 32px;
}
h1.smallest-size {
  font-size: 22px;
  font-weight: 300;
}
h1.infinity-size {
  font-size: 62px;
  opacity: 0.8;
  line-height: 48px;
}
/* ----------------------------------------------
 * Generated by Animista on 2017-4-2 1:26:48
 * http://animista.net
 * T: @cssanimista
 * ---------------------------------------------- */
.tracking-in-expand {
  -webkit-animation: tracking-in-expand 0.7s cubic-bezier(0.215, 0.61, 0.355, 1) both;
  -moz-animation: tracking-in-expand 0.7s cubic-bezier(0.215, 0.61, 0.355, 1) both;
  animation: tracking-in-expand 0.7s cubic-bezier(0.215, 0.61, 0.355, 1) both;
}
.scale-up-center1 {
  -webkit-animation: scale-up-center 0.7s cubic-bezier(0.39, 0.575, 0.565, 1) 0.5s both;
  -moz-animation: scale-up-center 0.7s cubic-bezier(0.39, 0.575, 0.565, 1) 0.5s both;
  animation: scale-up-center 0.7s cubic-bezier(0.39, 0.575, 0.565, 1) 0.5s both;
}
.scale-up-center2 {
  -webkit-animation: scale-up-center2 0.7s cubic-bezier(0.39, 0.575, 0.565, 1) 0.6s both;
  -moz-animation: scale-up-center2 0.7s cubic-bezier(0.39, 0.575, 0.565, 1) 0.6s both;
  animation: scale-up-center2 0.7s cubic-bezier(0.39, 0.575, 0.565, 1) 0.6s both;
}
.scale-up-center3 {
  -webkit-animation: scale-up-center3 0.7s cubic-bezier(0.39, 0.575, 0.565, 1) 0.7s both;
  -moz-animation: scale-up-center3 0.7s cubic-bezier(0.39, 0.575, 0.565, 1) 0.7s both;
  animation: scale-up-center3 0.7s cubic-bezier(0.39, 0.575, 0.565, 1) 0.7s both;
}
@-webkit-keyframes shake-right {
  0%,
  100% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
    -webkit-transform-origin: 100% 50%;
    transform-origin: 100% 50%;
  }
  10% {
    -webkit-transform: rotate(2deg);
    transform: rotate(2deg);
  }
  20%,
  40%,
  60% {
    -webkit-transform: rotate(-4deg);
    transform: rotate(-4deg);
  }
  30%,
  50%,
  70% {
    -webkit-transform: rotate(4deg);
    transform: rotate(4deg);
  }
  80% {
    -webkit-transform: rotate(-2deg);
    transform: rotate(-2deg);
  }
  90% {
    -webkit-transform: rotate(2deg);
    transform: rotate(2deg);
  }
}
@keyframes shake-right {
  0%,
  100% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
    -webkit-transform-origin: 100% 50%;
    transform-origin: 100% 50%;
  }
  10% {
    -webkit-transform: rotate(2deg);
    transform: rotate(2deg);
  }
  20%,
  40%,
  60% {
    -webkit-transform: rotate(-4deg);
    transform: rotate(-4deg);
  }
  30%,
  50%,
  70% {
    -webkit-transform: rotate(4deg);
    transform: rotate(4deg);
  }
  80% {
    -webkit-transform: rotate(-2deg);
    transform: rotate(-2deg);
  }
  90% {
    -webkit-transform: rotate(2deg);
    transform: rotate(2deg);
  }
}
@-webkit-keyframes tracking-in-expand {
  0% {
    letter-spacing: -0.5em;
    opacity: 0;
  }
  40% {
    opacity: 0.6;
  }
  100% {
    opacity: 0.8;
  }
}
@keyframes tracking-in-expand {
  0% {
    letter-spacing: -0.5em;
    opacity: 0;
  }
  40% {
    opacity: 0.6;
  }
  100% {
    opacity: 0.8;
  }
}
@keyframes scale-up-center {
  0% {
    -webkit-transform: scale(0.2) rotate(90deg);
    transform: scale(0.2) rotate(90deg);
    opacity: 0;
  }
  100% {
    -webkit-transform: scale(1) rotate(0deg);
    transform: scale(1) rotate(0deg);
    opacity: 1;
  }
}
@keyframes scale-up-center2 {
  0% {
    -webkit-transform: scale(0.2) rotate(90deg);
    transform: scale(0.2) rotate(90deg);
    opacity: 0;
  }
  100% {
    -webkit-transform: scale(1.2) rotate(23deg);
    transform: scale(1.2) rotate(23deg);
    opacity: 1;
  }
}
@keyframes scale-up-center3 {
  0% {
    -webkit-transform: scale(0.2) rotate(135deg);
    transform: scale(0.2) rotate(135deg);
    opacity: 0;
  }
  100% {
    -webkit-transform: scale(1) rotate(45deg);
    transform: scale(1) rotate(45deg);
    opacity: 1;
  }
}
!

JS 

              
                'use strict'

var app = angular.module("calculatorApp", []);

app.controller("calculatorCtrl", function($scope){
  
  $scope.result = "";
  $scope.expression = "";
  $scope.errorCounter = 0;
  $scope.firstTime = true;
  $scope.hideResult = true;
  $scope.resultSize = "large";
  resetDisplay();
  
  $scope.clear = function(clearAll){
    if(clearAll == false){
      var size = $scope.expression.length;
      if(size > 1 && $scope.firstTime == false){
        $scope.expression = $scope.expression.substr(0, size-1);
        evaluateExpression();
        return;
      } 
    }
    resetDisplay();
  }
  
  $scope.handleClick = function(i){
    if($scope.firstTime){
      $scope.firstTime = false;
      $scope.expression = i;
      return;
    }
    $scope.expression += i;
    evaluateExpression();
  }
  
  function evaluateExpression(){
    try {
      $scope.result = eval($scope.expression);
      $scope.hideResult = false;
      $scope.errorCounter = 0;  
    } catch (e) {
      $scope.hideResult = true;
      $scope.errorCounter++;
    }
  }
  
  function resetDisplay(){
    $scope.firstTime = true;
    $scope.result = "";
    $scope.expression = "LotusCalculator";
    $scope.errorCounter = 0;
    $scope.hideResult = true;
  }
  
});
!
999px

Console