@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: 1vmin;
  --finalSize: 45vmin;
  --particleSize: 1.5vmin;
  --color1: yellow;
  --color2: khaki;
  --color3: white;
  --color4: lime;
  --color5: gold;
  --color6: mediumseagreen;
  --y: -40vmin;
  --x: -50%;
  --initialY: 60vmin;
  content: "";
  animation: firework 2s 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(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: 30%;
  top: 60%;
  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;
}
