div.g-btn
    -for(var i=0; i<200; i++)
        div.g-ball   

$count: 200;

html, body{
    height: 100%;
    background: #000;
    overflow: hidden;
    filter: blur(2px) contrast(25);
}

.g-btn {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 130px auto;
    cursor: pointer;
    
    // background: deeppink;
    // border-radius: 48% 45% 48% 46%;
    // animation: rotate 5s infinite linear;
    
    &::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        // background: linear-gradient(135deg, deeppink, red);
        background: #dc8165;
        border-radius: 48% 45% 48% 46%;
        animation: rotate 5s infinite linear;
        z-index: 0;
        // opacity: .5;
    }
    
    &::after {
        content: "Hover";
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 1;
        line-height: 200px;
        text-align: center;
        color: #000;
        font-size: 48px;
    }
}

.g-ball {
    position: absolute;
    top: 50px;
    transform: translate(0, 0);
    background: #fa8763;
    border-radius: 50%;
    z-index: -1;
    mix-blend-mode: screen;
}

@for $i from 0 to $count {
    .g-ball:nth-child(#{$i}) {
        $width: #{random(60)}px;
        
        width: $width;
        height: $width;
        left: calc(#{(random(100))}px + 30px);
    }
    
    .g-btn:hover .g-ball:nth-child(#{$i}) {
        animation: movetop .6s linear #{random(2000)/1000}s;
    }
}

@keyframes movetop {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(0, -180px);
        opacity: 0;
    }
}

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