.section_1 header {
  background-color: #000000;
  border-right: 2px dotted #000011;
}

.section_2 header {
  background-color: #000011;
  border-right: 2px dotted #000022;
}

.section_3 header {
  background-color: #000022;
  border-right: 2px dotted #000033;
}

.section_4 header {
  background-color: #000033;
  border-right: 2px dotted #000044;
}

.section_7 header {
  background-color: #000044;
  border-right: 2px dotted #000055;
}

.section_8 header {
  background-color: #000055;
  border-right: 2px dotted #000066;
}

.section_9 header {
  background-color: #000066;
  border-right: 2px dotted #000077;
}

.section_10 header {
  background-color: #000077;
  border-right: 2px dotted #000088;
}