.square3, .circle {
    width: 50px;
    height: 50px;
    display: inline-block;
    float: left;
}

#container {
    background-color: white;
    margin: 0 auto;
    width: 650px;
    height: 600px;
}

#block1 {
    background-color: rgb(188,193,189);
}

#block2 {
    background-color: rgb(206,213,208);
}

#block3 {
    background-color: rgba(221,226,236,255)
}

#block4 {
    background-color:rgba(196,215,229,255)
}

#block5 {
    background-color:rgba(136,168,217,255)
}

#block6 {
    background-color:rgba(211,216,217,255)
}

#block7 {
    background-color:whitesmoke
}
#block8 {
    background-color:black
}

#block9 {
    background-color:rgba(214,218,219,255)
}

#block10 {
    background-color:rgba(255,234,0,255)
}

#block11 {
    background-color:rgba(182,54,46,255)
}

h1 {
    text-align: center;
}