body {
  background: linear-gradient(
    var(--colorFondoArriba) 10%,
    var(--colorFondo) 100%
  );
  margin-left: auto;
  margin-right: auto;
  width: 80%;
  height: 100vh;
  max-width: 1024px;
  display: flex;
  justify-content: center;
  align-items: center;
}

:root {
  --radio: 2em;
  --radio-grande: 100%;
  --colorFondo: #000000;
  --colorFondoArriba: #5800ff;
  --colorPrincipal: #e900ff;
  --colorSecundario: #ffc600;
  --tamanioMaximo: 3;
}

.containers {
  width: 100%;
  display: flex;
  justify-content: space-around;
  align-items: center;
}

.containers div {
  font-size: 2em;
  color: var(--colorFondo);
  margin: 0.1em;
}

.circulo {
  width: var(--radio);
  height: var(--radio);
  border-radius: 50%;
  background-color: var(--colorPrincipal);
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.circulo::before {
  content: "";
  width: var(--radio-grande);
  height: var(--radio-grande);
  position: absolute;
  border-radius: 50%;
  opacity: 0.5;
  animation: circuloExterior 2s ease-out infinite;
  z-index: -1;
  background: linear-gradient(
    var(--colorSecundario) 30%,
    rgba(0, 0, 0, 0) 100%
  );
}

@keyframes circuloExterior {
  0% {
    transform: rotate(0deg) scale(0);
    opacity: 1;
  }
  100% {
    transform: rotate(360deg) scale(var(--tamanioMaximo));
    opacity: 0;
  }
}