.loading_container {
  position: absolute;
  top: 0;
  left: 0;
  background: rgba(255, 255, 255, .9);
  width: 100%;
  height: 100%;
  opacity: 0;
  -webkit-transition: var(--transition-all);
  transition: var(--transition-all);
  z-index: 10;
  overflow: hidden;
}

.loading_container.in_progress {
  opacity: 1;
}

.loading {
  max-width: 100%;
  width: 250px;
  height: 50px;
  line-height: 50px;
  text-align: center;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  font-family: helvetica, arial, sans-serif;
  text-transform: uppercase;
  font-weight: 900;
  color: #000;
  font-size: 1rem;
  letter-spacing: 0.2em;
}

.loading:before, .loading:after {
  content: "";
  display: block;
  width: 15px;
  height: 15px;
  background: #000;
  position: absolute;
  animation: load .7s infinite alternate ease-in-out;
}

.loading:before {
  top: 0;
}

.loading:after {
  bottom: 0;
}

@keyframes load {
  0% { left: 0; height: 30px; width: 15px }
  50% { height: 8px; width: 40px }
  100% { left: calc(100% - 15px); height: 30px; width: 15px}
}