section {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: var(--darkBlue)
}
* {
  margin: 0;
  padding:0;
  box-sizing: border-box;
}
:root {
  --darkBlue: #001d30;
  --cream: #ffe4c4;
  --emerald: #40755e;
  --gold: #956d3c;
  --bronze: #634625;
}
.loader {
  position: absolute;
  width: 150px;
  height: 150px;
  background: rgb(0,29,48);
  background: linear-gradient(3deg, rgba(0,29,48,1) 42%, rgba(81,238,238,1) 100%);
  border-radius: 50%;
  animation: rotate 2s linear 20
}
.loader:before {
  content: '';
  position: absolute;
  inset: 20px 20px 0 0;
  background: #001d30;
  border-radius: 50%
}
.loader:after {
  content: '';
  position: absolute;
  width: 40px;
  height: 40px;
  background: #51eeee;
  border-radius: 50%;
  top: 50px;
  right: -8px;
  box-shadow:
    0 0 5px #51eeee,
    0 0 25px #51eeee,
    0 0 50px #51eeee,
    0 0 75px #51eeee
}
@keyframes rotate {
  100% {
    transform: rotate(360deg);
  }
}