Init HTML

Hình ảnh chỉ mang tính chất minh họa, xem demo trực tiếp tại đây.

CSS

Thêm đoạn CSS.

.pyro > .before, .pyro > .after {
  position: absolute;
  width: 7px;
  height: 7px;
  pointer-events: none;
  z-index: 99999999;
  border-radius: 50%;
  box-shadow: -120px -218.66667px blue, 248px -16.66667px #00ff84, 190px 16.33333px #002bff, -113px -308.66667px #ff009d, -109px -287.66667px #ffb300, -50px -313.66667px #ff006e, 226px -31.66667px #ff4000, 180px -351.66667px #ff00d0, -12px -338.66667px #00f6ff, 220px -388.66667px #99ff00, -69px -27.66667px #ff0400, -111px -339.66667px #6200ff, 155px -237.66667px #00ddff, -152px -380.66667px #00ffd0, -50px -37.66667px #00ffdd, -95px -175.66667px #a6ff00, -88px 10.33333px #0d00ff, 112px -309.66667px #005eff, 69px -415.66667px #ff00a6, 168px -100.66667px #ff004c, -244px 24.33333px #ff6600, 97px -325.66667px #ff0066, -211px -182.66667px #00ffa2, 236px -126.66667px #b700ff, 140px -196.66667px #9000ff, 125px -175.66667px #00bbff, 118px -381.66667px #ff002f, 144px -111.66667px #ffae00, 36px -78.66667px #f600ff, -63px -196.66667px #c800ff, -218px -227.66667px #d4ff00, -134px -377.66667px #ea00ff, -36px -412.66667px #ff00d4, 209px -106.66667px #00fff2, 91px -278.66667px #000dff, -22px -191.66667px #9dff00, 139px -392.66667px #a6ff00, 56px -2.66667px #0099ff, -156px -276.66667px #ea00ff, -163px -233.66667px #00fffb, -238px -346.66667px #00ff73, 62px -363.66667px #0088ff, 244px -170.66667px #0062ff, 224px -142.66667px #b300ff, 141px -208.66667px #9000ff, 211px -285.66667px #ff6600, 181px -128.66667px #1e00ff, 90px -123.66667px #c800ff, 189px 70.33333px #00ffc8, -18px -383.66667px #00ff33, 100px -6.66667px #ff008c;
  -moz-animation: 1s bang ease-out infinite backwards, 1s gravity ease-in infinite backwards, 5s position linear infinite backwards;
  -webkit-animation: 1s bang ease-out infinite backwards, 1s gravity ease-in infinite backwards, 5s position linear infinite backwards;
  -o-animation: 1s bang ease-out infinite backwards, 1s gravity ease-in infinite backwards, 5s position linear infinite backwards;
  -ms-animation: 1s bang ease-out infinite backwards, 1s gravity ease-in infinite backwards, 5s position linear infinite backwards;
  animation: 1s bang ease-out infinite backwards, 1s gravity ease-in infinite backwards, 5s position linear infinite backwards; }

.pyro > .after {
  -moz-animation-delay: 1.25s, 1.25s, 1.25s;
  -webkit-animation-delay: 1.25s, 1.25s, 1.25s;
  -o-animation-delay: 1.25s, 1.25s, 1.25s;
  -ms-animation-delay: 1.25s, 1.25s, 1.25s;
  animation-delay: 1.25s, 1.25s, 1.25s;
  -moz-animation-duration: 1.25s, 1.25s, 6.25s;
  -webkit-animation-duration: 1.25s, 1.25s, 6.25s;
  -o-animation-duration: 1.25s, 1.25s, 6.25s;
  -ms-animation-duration: 1.25s, 1.25s, 6.25s;
  animation-duration: 1.25s, 1.25s, 6.25s; }

@-webkit-keyframes bang {
  from {
    box-shadow: 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white; } }
@-moz-keyframes bang {
  from {
    box-shadow: 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white; } }
@-o-keyframes bang {
  from {
    box-shadow: 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white; } }
@-ms-keyframes bang {
  from {
    box-shadow: 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white; } }
@keyframes bang {
  from {
    box-shadow: 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white, 0 0 white; } }
@-webkit-keyframes gravity {
  to {
    transform: translateY(200px);
    -moz-transform: translateY(200px);
    -webkit-transform: translateY(200px);
    -o-transform: translateY(200px);
    -ms-transform: translateY(200px);
    opacity: 0; } }
@-moz-keyframes gravity {
  to {
    transform: translateY(200px);
    -moz-transform: translateY(200px);
    -webkit-transform: translateY(200px);
    -o-transform: translateY(200px);
    -ms-transform: translateY(200px);
    opacity: 0; } }
@-o-keyframes gravity {
  to {
    transform: translateY(200px);
    -moz-transform: translateY(200px);
    -webkit-transform: translateY(200px);
    -o-transform: translateY(200px);
    -ms-transform: translateY(200px);
    opacity: 0; } }
@-ms-keyframes gravity {
  to {
    transform: translateY(200px);
    -moz-transform: translateY(200px);
    -webkit-transform: translateY(200px);
    -o-transform: translateY(200px);
    -ms-transform: translateY(200px);
    opacity: 0; } }
@keyframes gravity {
  to {
    transform: translateY(200px);
    -moz-transform: translateY(200px);
    -webkit-transform: translateY(200px);
    -o-transform: translateY(200px);
    -ms-transform: translateY(200px);
    opacity: 0; } }
@-webkit-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%; } }
@-moz-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%; } }
@-o-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%; } }
@-ms-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%; } }
@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%; } }

HTML

Để bắn pháo hoa, các bạn thêm đoạn mã sau.

<div class="pyro"><div class="before"></div><div class="after"></div></div>

Vào vị trí cần hiển thị. Có thể điều chỉnh kích thước pháo hoa bằng cách đặt lại thông số width và height của .pyro > .before, .pyro > .after.

Chúc các bạn thành công!