.loader {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: inline-block;
  border-top: 3px solid #fff;
  border-right: 3px solid transparent;
  box-sizing: border-box;
  animation: rotation 1s linear infinite;
}

@keyframes rotation {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.backdrop {
  display: none;
  background-color: rgba(0, 0, 0, 0.5);
  position: fixed;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: 9999;
}

.backdrop.show {
  display: flex;
}