#container {
    border: 2px solid blue;
    background-color: black;
    position: relative;
    height: 1100px;
    width: 870px;
    left: 0px;
    top: 0px;
}

#center {
    left: 50%;
    top: 50%;
    width: 75px;
    height: 75px;
    position: absolute;
    border-radius: 20%;
}


.elem {
    background-color: aqua;
    position: absolute;
}


#elem1 {
    width: 100px;
    height: 100px;
    left: 0%;
    top: 0%;
}

#elem2 {
    width: 100px;
    height: 100px;
    right: 0%;
    bottom: 0%;
}

#elem3 {
    width: 75px;
    height: 75px;
    bottom: 10%;
    left: 0%;
}

#elem4 {
    width: 75px;
    height: 75px;
    right: 25%;
    top: 0%;
}

#elem5 {
    width: 100px;
    height: 100px;    
    top: 70%;
    right: 50%;
}

#elem6 {
    width: 75px;
    height: 75px;
    bottom: 70%;
    right: 70%;
}

#elem7 {
    width: 100px;
    height: 100px;    
    top: 35%;
    left: 75%;
}

button {
    display: block;
    width: 100%;
    height: 100px;
    font-size: 40px;
    visibility: hidden;
    
}

a {
    font-size: 80px;
}