rolens/frontend/src/styles/loading.css

#app-loading {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  display: flex;
}

/* Source of the following CSS: https://loading.io/css/ (modified) */

#app-loading .ring {
  display: inline-block;
  position: relative;
  width: 136px;
  height: 136px;
  margin: auto;
}

#app-loading .ring div {
  box-sizing: border-box;
  display: block;
  position: absolute;
  width: 120px;
  height: 120px;
  margin: 8px;
  border: 8px solid;
  border-radius: 50%;
  animation: loading-ring 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
  border-color: #f1dac8 transparent transparent transparent;
}

#app-loading .ring div:nth-child(1) {
  animation-delay: -0.45s;
}
#app-loading .ring div:nth-child(2) {
  animation-delay: -0.3s;
}
#app-loading .ring div:nth-child(3) {
  animation-delay: -0.15s;
}

@keyframes loading-ring {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}