#container {
    border: 1px solid #aaa;
    height: 400px;
    width: 580px;
    margin: 0 auto;
    padding: 10px;
    position: relative;
}


#main {
    background-color: red;
    width: 100px;
    height: 100px;
    position: absolute;
    left: 210px;
    top: 160px;
    border-radius: 50px;
    transition: all 2s ease-in-out 0s;
}

#container:hover #main {
    opacity: 0;
    
}

#ball1, #ball2, #ball3, #ball4, #ball5, #ball6, #ball7, #ball8 {
    background-color: green;
    height: 20px;
    width: 20px;
    border-radius: 10px;
    position: absolute;
    top: 200px;
    left: 250px;
    transition: all 2s ease-in-out 0s;
}

#ball1 {
    transition-delay: 0.1s;

}
#ball2 {
    transition-delay: 0.2s;

}
#ball3 {
    transition-delay: 0.3s;

}
#ball4 {
    transition-delay: 0.4s;

}
#ball5 {
    transition-delay: 0.5s;

}
#ball6 {
    transition-delay: 0.6s;

}
#ball7 {
    transition-delay: 0.7s;

}
#ball8 {
    transition-delay: 0.8s;

}

#container:hover #ball1 {
    transform: translate(-250px,200px);
}
#container:hover #ball2 {
    transform: translate(0,-200px);
}
#container:hover #ball3 {
    transform: translate(250px,-200px);
}
#container:hover #ball4 {
    transform: translate(250px,0px);
}
#container:hover #ball5 {
    transform: translate(250px,200px);
}
#container:hover #ball6 {
    transform: translate(0px,200px);
}
#container:hover #ball7 {
    transform: translate(-250px,-200px);
}
#container:hover #ball8 {
    transform: translate(-250px,0px);
}