.hide {
  opacity: 0;
  visibility: hidden;
}

.remove {
  display: none !important;
}

.blur {
  -webkit-filter: blur(12px);
          filter: blur(12px);
}

#firework-container {
  height: 100%;
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: center;
          justify-content: center;
  -webkit-box-align: center;
          align-items: center;
  position:absolute;
  top: 0;
  box-sizing: border-box;
}

.stage-container {
  overflow: hidden;
  box-sizing: initial;
  border: 1px solid #222;
  margin: -1px;
}
@media (max-width: 840px) {
  .stage-container {
    border: none;
    margin: 0;
  }
}

.canvas-container {
  width: 100%;
  height: 100%;
  -webkit-transition: -webkit-filter 0.3s;
  transition: -webkit-filter 0.3s;
  transition: filter 0.3s;
  transition: filter 0.3s, -webkit-filter 0.3s;
  box-sizing: border-box;
}
.canvas-container canvas {
  position: absolute;
  mix-blend-mode: lighten;
  -webkit-transform: translateZ(0);
          transform: translateZ(0);
}