.loader {
  width: 48px;
  height: 48px;
  display: block;
  margin: 20px auto;
  box-sizing: border-box;
  position: relative;
}

.loader::after {
  content: '';
  width: 48px;
  height: 48px;
  left: 0;
  bottom: 0;
  position: absolute;
  border-radius: 50% 50% 0;
  border: 15px solid red;
  transform: rotate(45deg) translate(0, 0);
  box-sizing: border-box;
  animation: animMarker 0.4s ease-in-out infinite alternate;
}

.loader::before {
  content: '';
  box-sizing: border-box;
  position: absolute;
  left: 0;
  right: 0;
  margin: auto;
  top: 150%;
  width: 24px;
  height: 4px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.2);
  animation: animShadow 0.4s ease-in-out infinite alternate;
}

@keyframes animMarker {
  0% {
    transform: rotate(45deg) translate(5px, 5px);
  }

  100% {
    transform: rotate(45deg) translate(-5px, -5px);
  }
}

@keyframes animShadow {
  0% {
    transform: scale(0.5);
  }

  100% {
    transform: scale(1);
  }
}