html body .area-page .ventilation-animation{padding:0;display:block;position:relative;min-height:0;aspect-ratio:4/3;background:radial-gradient(ellipse at 50% 70%,#edf4f8,#fff 75%)}
.ventilation-animation svg{display:block;width:100%;height:100%}
.air-return-circuit{fill:none;stroke-linecap:round;stroke-linejoin:round;color:#008fc7}
.air-return-track{stroke:white;stroke-width:16;opacity:.65}
.air-return-stream{stroke:currentColor;stroke-width:7;stroke-dasharray:32 24;animation:air-return-flow 1.5s linear infinite}
.air-return-arrow{stroke:currentColor;stroke-width:7;filter:drop-shadow(0 0 4px white)}
@keyframes air-return-flow{to{stroke-dashoffset:-56}}
@media(prefers-reduced-motion:reduce){.air-return-stream{animation:none}.air-return-arrow{display:none}}