html, body {
  padding: 0;
  margin: 0;
  width: 100%;
  height: 100%;
}
svg {
  width: 100%;
  height: 100%;
  background: white;
}
.x_label, .y_label {
  font-family: sans-serif;
  font-size: 1px;
  cursor: pointer;
}
.x_label {
  text-anchor: start;
}
.y_label {
  text-anchor: end;
}
.cell, .x_label, .y_label {
  fill: #BBB;
}
.selected {
  fill: black;
}

.filter_box {
  position: absolute;
  top: 10px;
  left: 10px;
  font-family: sans-serif;
}