html,
body {
  margin: 0 auto;
}

.container {
  height: 100vh;
  display: flex;
  flex-flow: column;
  justify-content: center;
}

.row {
  display: flex;
  flex-flow: row;
  justify-content: center;
}

.loader {
  width: 50px;
  aspect-ratio: 1;
  display: grid;
  border: 4px solid #0000;
  border-radius: 50%;
  border-color: #ccc #0000;
  animation: l16 1s infinite linear;
}

.loader::before,
.loader::after {
  content: '';
  grid-area: 1/1;
  margin: 2px;
  border: inherit;
  border-radius: 50%;
}

.loader::before {
  border-color: #9f2241 #0000;
  animation: inherit;
  animation-duration: 0.5s;
  animation-direction: reverse;
}

.loader::after {
  margin: 8px;
}

@keyframes l16 {
  100% {
    transform: rotate(1turn);
  }
}