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HTML

              
                  <bokeh></bokeh>
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<div class="mobile">Open in desktop</div>
<div class="pyro">
  <div class="before"></div>
  <div class="after"></div>
</div>
<h1>Feliz Cumpleaños Pratik!</h1>
<h2>Happy Birthday Bro!</h2>
<span>🎉</span>
<div class="candle">
   <div id="flame" class="lit"></div>
</div>

<div class="cake"></div>
<div class="plate"></div>

              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Concert+One|Pacifico');

.mobile {
  position: fixed;
  text-align: center;
  width: 100%;
  top: 50px;
  font-size: 90px;
  display: block;
}

h1, h2, span {
  display: none;
}

@media screen and (min-width: 670px) {
  
  .mobile {
    display: none;
  }
  
  h1, h2, span {
  display: block;
}
 $colors: #ef8d22, #feff28, #2bd8ff, #fc85e1;
$particles: 50;
$width: 500;
$height: 500;

// Create the explosion...
$box-shadow: ();
$box-shadow2: ();
@for $i from 0 through $particles {
  $box-shadow: $box-shadow,
               random($width)-$width / 2 + px
               random($height)-$height / 1.2 + px
               hsl(random(360), 100, 50);
  $box-shadow2: $box-shadow2, 0 0 #fff
}
@mixin keyframes ($animationName) {
    @-webkit-keyframes #{$animationName} {
        @content;
    }

    @-moz-keyframes #{$animationName} {
        @content;
    }

    @-o-keyframes #{$animationName} {
        @content;
    }

    @-ms-keyframes #{$animationName} {
        @content;
    }

    @keyframes #{$animationName} {
        @content;
    }
}

@mixin animation-delay ($settings) {
    -moz-animation-delay: $settings;
    -webkit-animation-delay: $settings;
    -o-animation-delay: $settings;
    -ms-animation-delay: $settings;
    animation-delay: $settings;
}

@mixin animation-duration ($settings) {
    -moz-animation-duration: $settings;
    -webkit-animation-duration: $settings;
    -o-animation-duration: $settings;
    -ms-animation-duration: $settings;
    animation-duration: $settings;
}

@mixin animation ($settings) {
    -moz-animation: $settings;
    -webkit-animation: $settings;
    -o-animation: $settings;
    -ms-animation: $settings;
    animation: $settings;
}

@mixin transform ($settings) {
    transform: $settings;
    -moz-transform: $settings;
    -webkit-transform: $settings;
    -o-transform: $settings;
    -ms-transform: $settings;
}

body{
 background: linear-gradient(to right, #e2b8f7, #d4bafa, #c7bcfb, #b9befb, #acbff9);
 cursor: crosshair;
 perspective: 1000px;
 transform-style: preserve-3d;
 font-family: "Pacifico",cursive;
}

h1 {
  position: fixed;
  text-align: center;
  width: 100%;
  top: 120px;
  font-size: 90px;
  background: -webkit-linear-gradient(0deg, rgba(206,173,252,1) 0%, rgba(163,187,251,1) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-family: 'Concert One', cursive;
  font-weight: 400;
  z-index: -1;
  letter-spacing: 6px;
}

span {
  position: fixed;
  text-align: center;
  width: 100%;
  top: 70px;
  font-size: 70px;
}

h2 {  
  position: fixed;
  text-align: center;
  width: 100%;
  top: 50px;
  font-size: 90px;
  background: -webkit-linear-gradient(90deg, rgba(233,230,255,1) 0%, rgba(255,255,255,1) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

bokeh {
  position: fixed;
  width: 2vmin;
  height: 2vmin;
  border-radius: 50%;
  animation-name: explosion;
  animation-iteration-count: infinite;
  animation-direction: reverse;
  animation-timing-function: cubic-bezier(0.84, 0.02, 1, 1);
  @for $i from 1 through 100 {
    &:nth-child(#{$i}) {
      $color: ceil(random() * 4);
      background-color: nth($colors, $color);
      $x: random() * 100vw;
      $y: random() * 100vh;
      transform: translate($x, $y);
      animation-duration: random() * 3s + 2s;
      animation-delay: random() * -5s;
    }
  }
}
@keyframes explosion {
  0% {
    opacity: 0;
  }
  70% {
    opacity: 1;
  }
  100% {
    transform: translate(50vw, 100vh);
  }
}



.cake {
  position: relative;
  top: 250px;
  margin: auto;
  width: 200px;
  height: 60px;
  background: #f9fdff;
  border-radius: 100%;
  transform: translateZ(100px);
  

  box-shadow: 
    0px 4px 0px #f4f9fd, 
    0px 8px 0px #dba9ff, 
    0px 12px 0px #fec3b3, 
    
    0px 16px 0px #f7f6fb, 
    0px 20px 0px #f7f6fb, 
    0px 24px 0px #f7f6fb,
    0px 28px 0px #f7f6fb,
    0px 32px 0px #fea0bb,
    0px 36px 0px #fea0bb,
    0px 40px 0px #9cef9d,
    0px 44px 0px #9cef9d, 
    
    0px 48px 0px #f7f6fb, 
    0px 52px 0px #f7f6fb, 
    0px 56px 0px #f7f6fb, 
    0px 60px 0px #f7f6fb, 
    0px 64px 0px #f7f6fb, 
    0px 68px 0px #dfa5fc, 
    0px 72px 0px #dfa5fc, 
    0px 76px 0px #fafffe, 
    0px 80px 0px #fafffe;
}

.plate {
  position: absolute;
  height: 90px;
  width: 300px;
  bottom:-95px;
  left: 50%;
  top: 380px;
  margin-left: -150px;
  border-radius: 100%;
  background: radial-gradient(ellipse closest-side at center, rgba(8,199,254,1) 0%, rgba(4,215,242,1) 71%, rgba(2,255,208,1) 100%);
  box-shadow: 
    0px 3px 0px #00e2e1,
    0px 6px 0px #00d3fb;
  transform: translateZ(80px);
}

.candle {
  position: relative;
  height: 50px;
  width: 12px;
  top: 280px;
  margin: auto;
  background: linear-gradient(0deg, rgba(183,244,167,1) 0%, rgba(255,255,255,1) 100%);
  border-radius: 4px;
  transform: translateZ(120px);
}

#flame {
   position: absolute;
   z-index: 10; 
}

.lit {
   background: linear-gradient(to bottom, #FFF6D9, #FBC36C);
  width: 15px;
  height: 35px;
  
  
/*  Info on border radius. http://www.css3.info/preview/rounded-border/ */
    
  border-top-left-radius: 10px 35px;    
  border-top-right-radius:  10px 35px;
  border-bottom-right-radius: 10px 10px;
  border-bottom-left-radius: 10px 10px;
  top: -34px;
  margin: auto;
  
/*   http://www.css3.info/preview/box-shadow/ */
  box-shadow: 
    0 0 17px 7px rgba(251, 246, 190, 0.71); 
  transform-origin: bottom;
  animation: flicker 1s ease-in-out alternate infinite;
}

@keyframes flicker {
  0% {
    transform: skewX(5deg);
    box-shadow: 
    0 0 17px 10px rgba(251, 246, 190, 0.71);
  }
  
  25% {
    transform: skewX(-5deg);
    box-shadow: 
    0 0 17px 5px rgba(251, 246, 190, 0.71);
  }
  
  50% {
    transform: skewX(10deg);
    box-shadow: 
    0 0 17px 7px rgba(251, 246, 190, 0.71);
  }
  
  75% {
    transform: skewX(-10deg);
    box-shadow: 
    0 0 17px 5px rgba(251, 246, 190, 0.71);
  }
  
  100% {
    transform: skewX(5deg);
    box-shadow: 
    0 0 17px 10px rgba(251, 246, 190, 0.71);
  }
}

.pyro > .before, .pyro > .after {
  position: fixed;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  box-shadow: $box-shadow2;
  @include animation((1s bang ease-out infinite backwards, 1s gravity ease-in infinite backwards, 5s position linear infinite backwards));
}
    
.pyro > .after {
  @include animation-delay((1.25s, 1.25s, 1.25s));
  @include animation-duration((1.25s, 1.25s, 6.25s));
}
        
@include keyframes(bang) {
  to {
    box-shadow:$box-shadow;
  }
}
    
@include keyframes(gravity)  {
  to {
    @include transform(translateY(200px));
    opacity: 0;
  }
}
    
@include keyframes(position) {
  0%, 19.9% {
    margin-top: 10%;
    margin-left: 40%;
  }
  20%, 39.9% {
    margin-top: 40%;
    margin-left: 30%;
  }
  40%, 59.9% {  
    margin-top: 20%;
    margin-left: 70%
  }
  60%, 79.9% {  
    margin-top: 30%;
    margin-left: 20%;
  }
  80%, 99.9% {  
    margin-top: 30%;
    margin-left: 80%;
  }
}

}


              
            
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JS

              
                
              
            
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