@function randomNum($max, $min: 0, $u: 1) {

  @return ($min + random($max)) * $u;

}

​

@function randomConicGradient() {

    $n: random(30) + 10;

  $list: ();

  @for $i from 0 to $n {

    $list: $list, rgb(randomNum(255), randomNum(255), randomNum(255));

  }

  @return conic-gradient($list, nth($list, 1));

}

​

div {

    position: absolute;

    top: 50%;

    left: 50%;

    margin: -100vmax;

    width: 200vmax;

    height: 200vmax;

    background: randomConicGradient();

    animation: rotate 6s ease-in-out infinite;

}

​

@keyframes rotate { 

    to { 

        transform: rotate(1turn); 

    } 

}