audio-vis/raw/scss/_notification.scss

.notification {
  right: 10px;
  top: 0;
  height: 100%;
  display: flex;
  flex-direction: column-reverse;
  width: 90%;
  max-width: 400px;
  pointer-events: none;

  .notification-item {
    margin-top: 10px;
  }

  div {
    position: unset;
    padding: unset;
  }

  div.notification-item {
    position: relative;
  }
}

.notification-item {
  width: 100%;
  border-radius: 5px;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.23);
  overflow: hidden;

  &.success {
    background-color: $success;
  }

  &.error {
    background-color: $error;
  }

  &.warning {
    background-color: $warning;
  }

  &.info {
    background-color: $info;
  }

  .message {
    padding: 1em;
  }
}

.notification-item .fade-bar {
  animation: fadeOut ease-in-out 3000ms;
  height: 100%;
  width: 100%;
  position: absolute;
  top: 0;
  z-index: -1;
  opacity: 0.4;
  transform-origin: left;

  &:after {
    content: '';
    z-index: 1;
    bottom: 0;
    height: 4px;
    width: 100%;
    position: absolute;
    background-color: #fff;
  }

  &.endless {
    animation: endlessFade ease-in-out 500ms infinite;
  }

  &.success {
    background-color: $successBorder;
  }

  &.error {
    background-color: $errorBorder;
  }

  &.warning {
    background-color: $warningBorder;
  }

  &.info {
    background-color: $primary;
  }
}

@keyframes fadeOut {
  from {
    transform: scaleX(1);
  }
  to {
    transform: scaleX(0);
  }
}

@keyframes endlessFade {
  0% {
    transform: scaleX(1);
    transform-origin: right;
  }
  49% {
    transform-origin: right;
  }
  50% {
    transform: scaleX(0);
    transform-origin: left;
  }
  100% {
    transform: scaleX(1);
  }
}