#container {
    width: 483px;
    height: 483px;
    border: 1px solid black;
    margin-left: auto;
    margin-right: auto;
    box-sizing: border-box;
}

.pixel {
    box-sizing: border-box;
    width: 15px;
    height: 15px;
    float: left;
}

.a {
    background-color: #686f99;
}

.b {
    background-color: #e0e0e8;
}

.c {
    background-color: #21181b;
}

.d {
    background-color: #a7acc7;
}

.e {
    background-color: #1c2559;
}

.f {
    background-color: #273377;
}

.g {
    background-color: #7e7979;
}