@keyframes firework {
    0% { transform: translate(var(--x), var(--initialY)); width: var(--initialSize); opacity: 1; }
    50% { width: 0.5vmin; opacity: 1; }
    100% { width: var(--finalSize); opacity: 0; }
  }
  
  /* @keyframes fireworkPseudo {
  0% { transform: translate(-50%, -50%); width: var(--initialSize); opacity: 1; }
  50% { width: 0.5vmin; opacity: 1; }
  100% { width: var(--finalSize); opacity: 0; }
  }
  */
  .firework,
  .firework::before,
  .firework::after
  {
  --initialSize: 0.5vmin;
  --finalSize: 45vmin;
  --particleSize: 0.2vmin;
  --color1: yellow;
  --color2: khaki;
  --color3: white;
  --color4: lime;
  --color5: gold;
  --color6: mediumseagreen;
  --y: -30vmin;
  --x: -50%;
  --initialY: 60vmin;
  content: "";
  animation: firework 3s infinite;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, var(--y));
  width: var(--initialSize);
  aspect-ratio: 1;
  background: 
  /*
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 0% 0%,
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 100% 0%,
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 100% 100%,
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 0% 100%,
  */
  
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 50% 0%,
  radial-gradient(circle, var(--color2) var(--particleSize), #0000 0) 100% 50%,
  radial-gradient(circle, var(--color3) var(--particleSize), #0000 0) 50% 100%,
  radial-gradient(circle, var(--color4) var(--particleSize), #0000 0) 0% 50%,
  
  /* bottom right */
  radial-gradient(circle, var(--color5) var(--particleSize), #0000 0) 80% 90%,
  radial-gradient(circle, var(--color6) var(--particleSize), #0000 0) 95% 90%,
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 90% 70%,
  radial-gradient(circle, var(--color2) var(--particleSize), #0000 0) 100% 60%,
  radial-gradient(circle, var(--color3) var(--particleSize), #0000 0) 55% 80%,
  radial-gradient(circle, var(--color4) var(--particleSize), #0000 0) 70% 77%,
  
  /* bottom left */
  radial-gradient(circle, var(--color5) var(--particleSize), #0000 0) 22% 90%,
  radial-gradient(circle, var(--color6) var(--particleSize), #0000 0) 45% 90%,
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 33% 70%,
  radial-gradient(circle, var(--color2) var(--particleSize), #0000 0) 10% 60%,
  radial-gradient(circle, var(--color3) var(--particleSize), #0000 0) 31% 80%,
  radial-gradient(circle, var(--color4) var(--particleSize), #0000 0) 28% 77%,
  radial-gradient(circle, var(--color5) var(--particleSize), #0000 0) 13% 72%,
  
  /* top left */
  radial-gradient(circle, var(--color6) var(--particleSize), #0000 0) 80% 10%,
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 95% 14%,
  radial-gradient(circle, var(--color2) var(--particleSize), #0000 0) 90% 23%,
  radial-gradient(circle, var(--color3) var(--particleSize), #0000 0) 100% 43%,
  radial-gradient(circle, var(--color4) var(--particleSize), #0000 0) 85% 27%,
  radial-gradient(circle, var(--color5) var(--particleSize), #0000 0) 77% 37%,
  radial-gradient(circle, var(--color6) var(--particleSize), #0000 0) 60% 7%,
  
  /* top right */
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 22% 14%,
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 45% 20%,
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 33% 34%,
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 10% 29%,
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 31% 37%,
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 28% 7%,
  radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 13% 42%
  ;
  background-size: var(--initialSize) var(--initialSize);
  background-repeat: no-repeat;
  }
  
  .firework::before {
  --x: -50%;
  --y: -50%;
  --initialY: -50%;
  /*   transform: translate(-20vmin, -2vmin) rotate(40deg) scale(1.3) rotateY(40deg); */
  transform: translate(-50%, -50%) rotate(40deg) scale(1.3) rotateY(40deg);
  /*   animation: fireworkPseudo 2s infinite; */
  }
  
  .firework::after {
  --x: -50%;
  --y: -50%;
  --initialY: -50%;
  /*   transform: translate(44vmin, -50%) rotate(170deg) scale(1.15) rotateY(-30deg); */
  transform: translate(-50%, -50%) rotate(170deg) scale(1.15) rotateY(-30deg);
  /*   animation: fireworkPseudo 2s infinite; */
  }
  
  .firework:nth-child(1) {
  --x: 30vmin;
  }
  
  .firework:nth-child(1),
  .firework:nth-child(1)::before,
  .firework:nth-child(1)::after {
  --color1: pink;
  --color2: violet;
  --color3: fuchsia;
  --color4: orchid;
  --color5: plum;
  --color6: lavender;  
  --finalSize: 40vmin;
  left: 20%;
  top: 40%;
  animation-delay: -0.25s;
  }
  
  .firework:nth-child(2) {
  --x: 30vmin;
  }
  
  .firework:nth-child(2),
  .firework:nth-child(2)::before,
  .firework:nth-child(2)::after {
  --color1: pink;
  --color2: violet;
  --color3: fuchsia;
  --color4: orchid;
  --color5: plum;
  --color6: lavender;  
  --finalSize: 40vmin;
  left: 20%;
  top: 40%;
  animation-delay: -0.25s;
  }
  
  .firework:nth-child(3) {
  --x: -30vmin;
  --y: -50vmin;
  }
  
  .firework:nth-child(3),
  .firework:nth-child(3)::before,
  .firework:nth-child(3)::after {
  --color1: cyan;
  --color2: lightcyan;
  --color3: lightblue;
  --color4: PaleTurquoise;
  --color5: SkyBlue;
  --color6: lavender;
  --finalSize: 35vmin;
  left: 70%;
  top: 60%;
  animation-delay: -0.4s;
  }
  .firework:nth-child(4) {
  --x: -30vmin;
  --y: -50vmin;
  }
  
  .firework:nth-child(4),
  .firework:nth-child(4)::before,
  .firework:nth-child(4)::after {
  --color1: cyan;
  --color2: lightcyan;
  --color3: lightblue;
  --color4: PaleTurquoise;
  --color5: SkyBlue;
  --color6: lavender;
  --finalSize: 35vmin;
  left: 80%;
  top: 70%;
  animation-delay: -0.4s;
  }
  
  .firework:nth-child(5) {
  --x: -30vmin;
  --y: -50vmin;
  }
  
  .firework:nth-child(5),
  .firework:nth-child(5)::before,
  .firework:nth-child(5)::after {
  --color1: cyan;
  --color2: lightcyan;
  --color3: lightblue;
  --color4: PaleTurquoise;
  --color5: SkyBlue;
  --color6: lavender;
  --finalSize: 35vmin;
  left: 90%;
  top: 80%;
  animation-delay: -0.4s;
  }
  
  .firework:nth-child(6) {
  --x: 30vmin;
  }
  
  .firework:nth-child(6),
  .firework:nth-child(6)::before,
  .firework:nth-child(6)::after {
  --color1: pink;
  --color2: violet;
  --color3: fuchsia;
  --color4: orchid;
  --color5: plum;
  --color6: lavender;  
  --finalSize: 40vmin;
  left: 30%;
  top: 60%;
  animation-delay: -0.25s;
  }
  
  .firework:nth-child(7) {
  --x: 30vmin;
  }
  
  .firework:nth-child(7),
  .firework:nth-child(7)::before,
  .firework:nth-child(7)::after {
  --color1: pink;
  --color2: violet;
  --color3: fuchsia;
  --color4: orchid;
  --color5: plum;
  --color6: lavender;  
  --finalSize: 40vmin;
  left: 30%;
  top: 60%;
  animation-delay: -0.25s;
  }
  canvas#canvas {
  overflow-y: hidden;
  overflow-x: hidden;
  position:absolute;
  width: 100%;
  margin: 0;
  }