<section class="section">
  <div class="loader glowing">
    <span></span>
    <span></span>
    <span></span>
    <span></span>
  </div>
</section>
<section class="section">
  <div class="loader neumorphism">
    <span></span>
    <span></span>
  </div>
</section>

:root {
  --code-gray: #091921;
  --linear-gradient: linear-gradient(#14FFE9, #FFEB3B, #FF00E0);
  --mardi-grass: #240229;
}

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

body {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

.section {
  align-items: center;
  background-color: var(--code-gray);
  display: flex;
  flex: 1;
  justify-content: center;
  padding: 1rem;
}

.section:last-of-type {
  background-color: var(--mardi-grass);
}

.loader {
  border-radius: 50%;
  height: 12.5rem;
  position: relative;
  width: 12.5rem;
}

.loader::before {
  border-radius: 50%;
  bottom: 1.56rem;
  content: '';
  left: 1.56rem;
  position: absolute;
  right: 1.56rem;
  top: 1.56rem;
  z-index: 1;
}

.loader span {
  background: var(--linear-gradient);
  border-radius: 50%;
  filter: blur(20px);
  height: 100%;
  position: absolute;
  width: 100%;
}

/* Glowing */
.glowing {
  animation: spin 0.5s linear infinite;
  background: var(--linear-gradient);
}

.glowing::before {
  background-color: var(--code-gray);
}

.glowing span {
  filter: blur(5px);
}

.glowing span:nth-child(2) {
  filter: blur(10px);
}

.glowing span:nth-child(3) {
  filter: blur(25px);
}

.glowing span:last-child {
  filter: blur(50px);
}
/* Glowing */

/* Neumorphism */
.neumorphism {
  border: 0.25rem solid var(--mardi-grass);
  box-shadow: -5px -5px 5px rgba(255, 255, 255, 0.1), 10px 10px 10px rgba(0, 0, 0, 0.4),
  inset -5px -5px 5px rgba(255, 255, 255, 0.2), inset 10px 10px 10px rgba(0, 0, 0, 0.4);
  overflow: hidden;
}

.neumorphism::before {
  background-color: var(--mardi-grass);
  border: 0.15rem solid var(--mardi-grass);
  box-shadow: inset -2px -2px 5px rgba(255, 255, 255, 0.2), inset 3px 3px 5px rgba(0, 0, 0, 0.5);
}

.neumorphism span {
  animation: spin 0.5s linear infinite;
}
/* End neumorphism */

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@media screen and (max-width: 50rem) {
  body {
    flex-direction: column;
  }
}