#container{
    border: 1px solid #777;
    height: 400px;
    width: 500px;
    margin: 0 auto;
    padding: 10px;
    position: relative;
}

#main{
    background-color: red;
    width: 100px;
    height: 100px;
    position: absolute;
    top: 160px;
    left: 210px;
    border-radius: 50px;
    transition: all 1s ease-in-out 0s;
}

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

[id*="ball"]{
    background-color: blue;
    height: 20px;
    width: 20px;
    border-radius: 10px;
    position: absolute;
    top: 200px;
    left: 250px;
    transition: all 1s ease-in-out 0s;
}

#ball1{
    transition-delay: 0.1s;
}

#container:hover #ball1{
    transform: translate(-250px, 200px);
}

#ball2{
    transition-delay: 0.2s;
}

#container:hover #ball2{
    transform: translate(0px, -200px);
}

#ball3{
    transition-delay: 0.3s;
}

#container:hover #ball3{
    transform: translate(250px, -200px);
}

#ball4{
    transition-delay: 0.4s;
}

#container:hover #ball4{
    transform: translate(250px, 0px);
}

#ball5{
    transition-delay: 0.5s;
}

#container:hover #ball5{
    transform: translate(250px, 200px);
}

#ball6{
    transition-delay: 0.6s;
}

#container:hover #ball6{
    transform: translate(0px, 200px);
}

#ball7{
    transition-delay: 0.7s;
}

#container:hover #ball7{
    transform: translate(-250px, -200px);
}

#ball8{
    transition-delay: 0.8s;
}

#container:hover #ball8{
    transform: translate(-250px, 0px);
}