SOURCE

 
 <div class="loader">
     <span style="--i:1"></span>
     <span style="--i:2"></span>
     <span style="--i:3"></span>
     <span style="--i:4"></span>
     <span style="--i:5"></span>
     <span style="--i:6"></span>
     <span style="--i:7"></span>
 </div>
 <svg>
    <filter id="gooey">
      <feGaussianBlur in="SourceGraphic" stdDeviation="10"/>
      <feColorMatrix values="
        1 0 0 0 0
        0 1 0 0 0
        0 0 1 0 0
        0 0 0 20 -10
      "/>
    </filter>
  </svg>

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #010b10;
}

.loader {
    position: relative;
    width: 200px;
    height: 200px;
    filter: url(#gooey);
}

svg {
    width: 0;
    height: 0;
}

.loader span {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    animation: animate 4s ease-in-out infinite;
    animation-delay: calc(0.2s * var(--i));
}

.loader span::before{
    content: '';
    position: absolute;
    top: 0;
    left: calc(50% - 20px);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    box-shadow: 0 0 30px #03a9f4;
    background: linear-gradient(#fce4ec,#03a9f4)
}

@keyframes animate {
    0%{
        transform: rotate(0deg);
    }
    50%,100% {
        transform: rotate(360deg);
    }
}