.loader {
    position: fixed; /* or absolute */
    top: 50%;
    left: 50%;
    z-index: 9999;
}

.duo {
    height: 20px;
    width: 50px;
    background: hsla(0, 0%, 0%, 0.0);
    position: absolute;

}

.duo, .dot {
    animation-duration: 0.8s;
    animation-timing-function: ease-in-out;
    animation-iteration-count: infinite;
}

.duo1 {
    left: 0;
}

.duo2 {
    left: 30px
}


.dot {
    width: 20px;
    height: 20px;
    border-radius: 10px;
    background: #333;
    position: absolute;
}

.dot-a {
    left: 0px;
}

.dot-b {
    right: 0px;
}


@keyframes spin {
    0% { transform: rotate(0deg) }
    50% { transform: rotate(180deg) }
    100% { transform: rotate(180deg) }
}

@keyframes onOff {
    0% { opacity: 0; }
    49% { opacity: 0; }
    50% { opacity: 1; }
    100% { opacity: 1; }
}

.duo1 {
    animation-name: spin;
}

.duo2 {
    animation-name: spin;
    animation-direction: reverse;
}

.duo2 .dot-b {
    animation-name: onOff;
}

.duo1 .dot-a {
    opacity: 0;
    animation-name: onOff;
    animation-direction: reverse;
}



.app-loading {
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  top: 10em;
}
.app-loading p {
  display: block;
  font-size: 1.17em;
  margin-inline-start: 0px;
  margin-inline-end: 0px;
  font-weight: normal;
}