форма css

.opened {
  width: 100%;
  border-top: 2px dashed #800000;
    position: relative;
}

.opened tbody {
  position: relative;
}

.opened .postblock {
  background: none;
}

.opened .rules {
  display: none;
}
.opened tr:first-of-type {
  display: none;
}

.opened input {
  position: relative;
  display: inline;
}