body {
    margin: 0;
    border: 0;
    font-family: monospace;
}

h1 {
    font-size: 24px;
    text-align: center;
}

h2 {
    font-size: 18px;
    text-align: center;
}

h3 {
    font-size: 16px;
    text-align: center;
    color: dodgerblue;
}

.container {
    background-color: whitesmoke;
}

.box {
    background-color: dodgerblue;
    height: 100px;
    width: 100px;
    border: 1px solid lightgrey;
    text-align: center;
    font-size: 16px;
    font-weight: bold;
}

#flex {
    display:flex;
}

#flexstart {
    display:flex;
    justify-content:flex-start;
}

#flexend {
    display:flex;
    justify-content:flex-end;
}

#center {
    display:flex;
    justify-content:center;
}

#spacearound {
    display:flex;
    justify-content:space-around;
}

#spacebetween {
    display:flex;
    justify-content:space-between;
}