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HTML 

              
                main
 figure
   .bun.bun__top
     .face
       .eye.eye__left
       .eye.eye__right
       .mouth
     .seeds
       each seed in new Array(11)
         .seed
   .tomato
   .lettuce
     each leaf in new Array(6)
       .leaf
     .cover
       each arch in new Array(5)
         .arch
   .cheese
   .burger
     each spot in new Array(12)
       .spot
   .bun.bun__bottom
   .shadow
!

CSS 

              
                // Colors
$bg: #ffcb06;
$bun: #ff7f07;
$burger: #d76817;
$burger-spot: #b34b10;
$cheese: #edb039;
$eye: $bun;
$lettuce: #b3ba27;
$lettuce-shadow: #7e911d;
$outline: #701e13;
$seed: #ffc86d;
$shadow: #7f6501;
$tomato: #ff2200;
$tongue: $tomato;

// Variables
$figure-w: 128px;
$outline-w: 7px;
$animation-duration: 1s;

// Mixins
@mixin pseudo-shadow {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background-color: rgba(black, 0.1);
}

// Layout
* {
  box-sizing: border-box;
}
html, body {
  height: 100%;
  padding: 0;
  margin: 0;
}
body {
  overflow: hidden;
  background-color: $bg;
}
main {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  max-width: 500px;
  height: 100%;
  margin: auto;
  padding: 12px;
}

// Build a burger
figure {
  width: 100%;
  height: auto;
  max-width: $figure-w;
  animation: figure $animation-duration ease-in-out infinite;
  transform: translateZ(0)
}

.bun {
  position: relative;
  width: 128px;
  &__top {
    width: 114px;
    height: 70px;
    margin-left: $outline-w;
    border-top-width: 0;
    animation: bun-top $animation-duration ease-in-out infinite;
    &:before, &:after {
      content: "";
      position: absolute;
      width: 100%;
      background-color: $bun;
      box-shadow: inset rgba(black, 0.1) 21px 0 0;
      z-index: -1;
    }
    &:before {
      top: 0; left: -($outline-w);
      height: 100%;
      border: $outline-w solid $outline;
      border-radius: 100% 100% 0 0;
    }
    &:after {
      bottom: 0; left: -($outline-w);
      height: 40%;
      border-right: $outline-w solid $outline;
      border-left: $outline-w solid $outline;
    }
  }
  &__bottom {
    height: 30px;
    border-radius: 0 0 20px 20px;
    background-color: $bun;
    border: $outline-w solid $outline;
    box-shadow: inset rgba(black, 0.1) 21px 0 0;
    z-index: 2;
    animation: bun-bottom $animation-duration ease-in-out infinite;
  }
}

.seeds {
  position: absolute;
  top: 62px;
  left: 0;
  z-index: 2;
}
.seed {
  position: absolute;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 2px 3px 2px;
  border-color: transparent transparent $seed transparent;
  &:after {
    content: "";
    position: absolute;
    top: 2px;
    left: -2px;
    width: 4px;
    height: 3px;
    background-color: $seed;
    border-radius: 100%;
  }
  &:nth-child(1) {
    bottom: 26px;
    left: 10px;
  }
  &:nth-child(2) {
    bottom: 10px;
    left: 16px;
  }
  &:nth-child(3) {
    bottom: 39px;
    left: 27px;
  }
  &:nth-child(4) {
    bottom: 22px;
    left: 32px;
  }
  &:nth-child(5) {
    bottom: 48px;
    left: 46px;
  }
  &:nth-child(6) {
    bottom: 40px;
    left: 62px;
  }
  &:nth-child(7) {
    bottom: 45px;
    left: 78px;
  }
  &:nth-child(8) {
    bottom: 32px;
    left: 96px;
  }
  &:nth-child(9) {
    bottom: 9px;
    left: 45px;
  }
  &:nth-child(10) {
    bottom: 14px;
    left: 84px;
  }
  &:nth-child(11) {
    bottom: 10px;
    left: 102px;
  }
}

.tomato {
  position: relative;
  width: 144px;
  height: 24px;
  margin: -($outline-w) -8px; 
  background-color: $tomato;
  border: $outline-w solid $outline;
  border-radius: 100px;
  z-index: 3;
  animation: tomato $animation-duration ease-in-out infinite;
  &:before {
    @include pseudo-shadow;
    width: 29px;
  }
}

.lettuce {
  position: relative;
  width: 140px;
  height: 25px;
  margin: -($outline-w) -6px; 
  border-radius: 16px 16px 0 0;
  z-index: 2;
  animation: lettuce $animation-duration ease-in-out infinite;
}

.leaf {
  position: absolute;
  top: 0;
  width: 20px;
  height: 30px;
  background-color: $lettuce;
  border: $outline-w solid $outline;
  border-radius: 12px;
  z-index: 1;
  &:nth-child(1) {
    left: 0;
    background-color: $lettuce-shadow;
  }
  &:nth-child(2) {
    left: 24px;
    &:after {
      @include pseudo-shadow;
      width: 3px;
      background-color: $lettuce-shadow;
      border-radius: 0 0 0 100px;
    }
  }
  &:nth-child(3) {
    left: 48px;
  }
  &:nth-child(4) {
    left: 72px;
  }
  &:nth-child(5) {
    left: 96px;
  }
  &:nth-child(6) {
    left: 120px;
  }
}

.cover {
  position: absolute;
  top: -14px;
  left: $outline-w;
  width: 126px;
  height: 32px;
  background-color: $lettuce;
  border-top: $outline-w solid $outline;
  z-index: 2;
  &:before {
    @include pseudo-shadow;
    background-color: $lettuce-shadow;
    width: 27px;
    border-radius: 12px 0 0 0;
  }
}

.arch {
  position: absolute;
  bottom: -2px;
  width: 18px;
  height: 10px;
  background-color: $cheese;
  border: $outline-w solid $outline;
  border-bottom-width: 0;
  border-radius: 100px 100px 0 0;
  &:nth-child(1) {
    left: 6px;
    &:before {
      @include pseudo-shadow;
      width: 100%;
    }
  }
  &:nth-child(2) {
    left: 30px;
  }
  &:nth-child(3) {
    left: 54px;
  }
  &:nth-child(4) {
    left: 78px;
  }
  &:nth-child(5) {
    left: 102px;
  }
}

.cheese {
  position: relative;
  width: 128px;
  height: 32px;
  margin-top: -18px;
  background-color: $cheese;
  border: $outline-w solid $outline;
  border-top-width: 0;
  &:before {
    @include pseudo-shadow;
    width: 21px;
  }
}

.burger {
  position: relative;
  width: 144px;
  height: 24px;
  margin: -($outline-w) -8px; 
  background-color: $burger;
  border: $outline-w solid $outline;
  border-radius: 100px;
  animation: burger $animation-duration ease-in-out infinite;
  &:before {
    @include pseudo-shadow;
    width: 29px;
  }
}

.spot {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 100%;
  background-color: $burger-spot;
  &:nth-child(1) {
    top: 3px;
    left: 6px;
  }
  &:nth-child(2) {
    top: 4px;
    left: 20px;
    width: 2px;
    height: 2px;
  }
  &:nth-child(3) {
    top: 3px;
    left: 32px;
    width: 3px;
    height: 3px;
  }
  &:nth-child(4) {
    top: 4px;
    left: 46px;
    width: 2px;
    height: 2px;
  }
  &:nth-child(5) {
    top: 5px;
    left: 59px;
    width: 3px;
    height: 3px;
  }
  &:nth-child(6) {
    top: 3px;
    left: 70px;
    width: 2px;
    height: 2px;
  }
  &:nth-child(7) {
    top: 3px;
    left: 78px;
    width: 5px;
    height: 5px;
  }
  &:nth-child(8) {
    top: 2px;
    left: 88px;
    width: 2px;
    height: 2px;
  }
  &:nth-child(9) {
    top: 4px;
    left: 96px;
    width: 3px;
    height: 3px;
  }
  &:nth-child(10) {
    top: 3px;
    left: 106px;
    width: 4px;
    height: 4px;
  }
  &:nth-child(11) {
    top: 3px;
    left: 114px;
    width: 2px;
    height: 2px;
  }
  &:nth-child(12) {
    top: 3px;
    left: 120px;
    width: 4px;
    height: 4px;
  }
}

// Burger Face
.face {
  height: 26px;
  animation: face $animation-duration ease-in-out infinite;
}
.eye {
  position: absolute;
  bottom: 20px;
  width: 20%;
  height: 30%;
  background-color: $eye;
  border: $outline-w solid $outline;
  border-radius: 100%;
  &:before {
    content: "";
    position: absolute;
    bottom: -($outline-w); left: -($outline-w);
    width: calc(100% + 15px);
    height: calc(50% + 7px);
    background-color: $bun;
  }
  &__left {
    left: 42px;
  }
  &__right {
    left: 72px;
  }
}

.mouth {
  position: absolute;
  bottom: 14px;
  left: 57px;
  width: 20%;
  height: 30%;
  border-radius: 100%;
  overflow: hidden;
  &:before {
    content: "";
    position: absolute;
    bottom: 0; left: 0;
    width: 100%;
    height: 50%;
    background-color: $outline;
  }
  &:after {
    content: "";
    position: absolute;
    bottom: -5px;
    left: 6px;
    width: 11px;
    height: 11px;
    background-color: $tongue;
    border-radius: 100%;
  }
}

.shadow {
  width: 126px;
  height: 14px;
  background-color: $shadow;
  border-radius: 100px;
  z-index: -1;
  margin-top: -6px;
  margin-left: -6px;
  animation: shadow $animation-duration ease-in-out infinite;
}

// Animation time!
@keyframes figure {
  25% {
    transform: translateY(-30px);
  }
  50% {
    transform: translateY(0);
  }
}
@keyframes bun-top {
  10% {
    height: 54px;
  }
  25% {
    height: 70px;
  }
  40% {
    transform: translateY(-40px);
  }
  70% {
    transform: translateY(0);
  }
}
@keyframes tomato {
  40% {
    transform: rotate(2deg) translateY(-16px);
  }
  50% {
    transform: rotate(-2deg) translateY(-8px);
  }
  70% {
    transform: rotate(0) translateY(0);
  }
}
@keyframes lettuce {
  40% {
    transform: rotate(-2deg) translateY(-14px);
  }
  50% {
    transform: rotate(0) translateY(-7px);
  }
  70% {
    transform: rotate(0) translateY(0);
  }
}
@keyframes burger {
  40% {
    transform: rotate(-2deg) translateY(-8px);
  }
  50% {
    transform: rotate(2deg) translateY(-4px);
  }
  70% {
    transform: rotate(0) translateY(0);
  }
}
@keyframes bun-bottom {
  10% {
    height: 20px;
  }
  25% {
    height: 30px;
  }
}
@keyframes face {
  25% {
    height: 20px;
  }
  50% {
    height: 26px;
  }
}
@keyframes shadow {
  25% {
    width: 80px;
    transform: translate(28px,22px);
  }
  50% {
    width: 126px;
    transform: translate(0,0);
  }
}
!

JS 

              
                // Based on this dribbble shot by Nino Mamaladze: https://dribbble.com/shots/2520235-jumping-burg
!
999px

Console