.layer-cars {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
}

.car {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  will-change: transform, opacity;
}

.car img {
  display: block;
  width: 100%;
  height: auto;
}

@keyframes fly-diagonal {
  0%   { transform: translate3d(115%, 22%, 0) scale(0.85); opacity: 0; }
  8%   { opacity: 1; }
  92%  { opacity: 1; }
  100% { transform: translate3d(-25%, -8%, 0) scale(0.7); opacity: 0; }
}

@keyframes fly-horizontal {
  0%   { transform: translate3d(-25%, 0, 0) scaleX(-1) scale(1); opacity: 0; }
  8%   { opacity: 1; }
  92%  { opacity: 1; }
  100% { transform: translate3d(120%, 0, 0) scaleX(-1) scale(1); opacity: 0; }
}

.car--diagonal   { animation-name: fly-diagonal;   animation-timing-function: linear; }
.car--horizontal { animation-name: fly-horizontal; animation-timing-function: linear; }