<!-- Loader -->
<div class="blobs">
  <div class="blob-center"></div>
  <div class="blob"></div>
  <div class="blob"></div>
  <div class="blob"></div>
  <div class="blob"></div>
  <div class="blob"></div>
  <div class="blob"></div>
</div>
<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
  <defs>
    <filter id="goo">
      <feGaussianBlur in="SourceGraphic" stdDeviation="10" result="blur" />
      <feColorMatrix in="blur" mode="matrix" values="1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 18 -7" result="goo" />
      <feBlend in="SourceGraphic" in2="goo" />
    </filter>
  </defs>
</svg>

// Reset
html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  background: #030303;
}
svg {
  display: none;
}

$bolb-color: #FFF200;

// Loader
.blobs {
  filter: url(#goo);
  width: 300px;
  height: 300px;
  position: relative;
  overflow: hidden;
  border-radius: 70px;
  transform-style: preserve-3d;
  
  // Blob center item
  .blob-center {
    transform-style: preserve-3d;
    position: absolute;
    background: $bolb-color;
    top: 50%;
    left: 50%;
    width: 30px;
    height: 30px;
    transform-origin: left top;
    transform: scale(.9) translate(-50%, -50%);
    animation: blob-grow
      linear
      3.4s
      infinite;
    border-radius: 50%;
    box-shadow: 0 -10px 40px -5px $bolb-color;
  }
}

// Blob item
.blob {
  position: absolute;
  background: $bolb-color;
  top: 50%;
  left: 50%;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  animation: blobs
    ease-out
    3.4s
    infinite;
  transform: scale(.9) translate(-50%, -50%);
  transform-origin: center top;
  opacity: 0;
  
  // Set animation delay for each of type
  @for $i from 1 to 6 {
    &:nth-child(#{$i}) {
      animation-delay: $i * 0.2 + s;
    }
  }
}

// Keyframes variables
$left: calc(-330px - 50%);
$right: calc(330px - 50%);

// Keyframes
@keyframes blobs {
  0% {
    opacity: 0;
    transform: scale(0) translate($left, -50%);
  }
  1% {
    opacity: 1;
  }
  35%,65% {
    opacity: 1;
    transform: scale(.9) translate(-50%, -50%);
  }
  99% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: scale(0) translate($right, -50%);
  }
}

@keyframes blob-grow {
  0%,  39% {
    transform: scale(0) translate(-50%, -50%);
  }
  40%, 42% {
    transform: scale(1, .9) translate(-50%, -50%);
  }
  43%, 44% {
    transform: scale(1.2, 1.1) translate(-50%, -50%);
  }
  45%, 46% {
    transform: scale(1.3, 1.2) translate(-50%, -50%);
  }
  47%, 48% {
    transform: scale(1.4, 1.3) translate(-50%, -50%);
  }
  52%{
    transform: scale(1.5, 1.4) translate(-50%, -50%);
  }
  54% {
    transform: scale(1.7, 1.6) translate(-50%, -50%);
  }
  58% {
    transform: scale(1.8, 1.7) translate(-50%, -50%);
  }
  68%, 70% {
    transform: scale(1.7, 1.5) translate(-50%, -50%);
  }
  78% {
    transform: scale(1.6, 1.4) translate(-50%, -50%);
  }
  80%, 81% {
    transform: scale(1.5, 1.4) translate(-50%, -50%);
  }
  82%, 83% {
    transform: scale(1.4, 1.3) translate(-50%, -50%);
  }
  84%, 85% {
    transform: scale(1.3, 1.2) translate(-50%, -50%);
  }
  86%, 87% {
    transform: scale(1.2, 1.1) translate(-50%, -50%);
  }
  90%, 91% {
    transform: scale(1, .9) translate(-50%, -50%);
  }
  92%, 100% {
    transform: scale(0) translate(-50%, -50%);
  }
}