svg-css/bars-scale-fade.svg

<svg width="24" height="24" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><style>.spinner_hzlK{animation:spinner_vc4H .8s linear infinite;animation-delay:-.8s}.spinner_koGT{animation-delay:-.65s}.spinner_YF1u{animation-delay:-.5s}@keyframes spinner_vc4H{0%{y:1px;height:22px}93.75%{y:5px;height:14px;opacity:.2}}</style><rect class="spinner_hzlK" x="1" y="1" width="6" height="22"/><rect class="spinner_hzlK spinner_koGT" x="9" y="1" width="6" height="22"/><rect class="spinner_hzlK spinner_YF1u" x="17" y="1" width="6" height="22"/></svg>