* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-size: 16px;
  font-family: "Roboto", sans-serif;
}

.main-flex {
  display: grid;
  height: 100vh;
  align-content: center; /*eje Y*/
  justify-content: center; /*eje X*/
}

.spinner {
  border: 4px solid rgba(0,0,0, 0.1);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border-left-color: #09f;

  animation: keyframe-spin 1s ease infinite;
}

@keyframes keyframe-spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}