ol-ext/src/control/ProgressBar.css

A set of cool extensions for OpenLayers (ol) in node modules structure

.ol-control.ol-progress-bar {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0;
  pointer-events: none!important;
  background-color: transparent;
}

.ol-control.ol-progress-bar > .ol-bar {
  position: absolute;
  background-color: rgba(0,60,136,.5);
  left: 0;
  bottom: 0;
  height: .5em;
  width: 0;
  transition: width .2s;
  box-sizing: border-box;
}

.ol-progress-bar > .ol-waiting {
  display: none;
}

.ol-viewport .ol-control.ol-progress-bar > .ol-waiting {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  font-size: 2em;
  display: block;
  animation: 1s linear infinite ol-progress-bar-blink;
}

@keyframes ol-progress-bar-blink {
  0%, 30% {
    visibility: hidden;
  }
  100% {
    visibility: visible;
  }
}