rect {
    fill:#ece6e6;
    stroke:gray;
    stroke-width:1px;
}

line {
    stroke: darkgray;
    stroke-width: 1px;
}

.r0 {
    stroke: gray;
    stroke-width: 1px;
}

.r1 {
    stroke: lightgray;
    stroke-width: .8px;
}