:root{
  --loader-bg:#ffffff;
  --bus-w: 220px;
}

/* Overlay */
#floramarLoader{
  position:fixed;
  inset:0;
  background: var(--loader-bg);
  display:flex;
  align-items:center;
  justify-content:center;
  z-index:99999;
  overflow:hidden;
}

/* Ônibus */
#loaderBus{
  position:absolute;
  width: var(--bus-w);
  pointer-events:none;
  top: 50%;
  margin-top: -40px;
  will-change: left, transform;
}

/* ESQUERDA -> DIREITA (e volta) */
@keyframes busLeftToRight{
  0%   { left: calc(-1 * var(--bus-w)); transform: scaleX(1); }
  50%  { left: 100%;                   transform: scaleX(1); }
  51%  { transform: scaleX(-1); }
  100% { left: calc(-1 * var(--bus-w)); transform: scaleX(-1); }
}

#loaderBus.bus-anim{
  animation: busLeftToRight 4s linear infinite;
}