.c11s {
  fill: white;
  stroke: black;
}

.c12s {
  fill: gray;
  stroke: black;
}

.c2s {
  fill: black;
  stroke: black;
}

text {
  font-size: 15;
}

.l1 {
  stroke-width: 4;
  stroke: black;
}

.l2 {
  stroke-width: 2;
  stroke: black;
}

.l3 {
  stroke-width: 1;
  stroke: red;
}