.pre_container {
  position: relative;
}
.pre_mark {
  position: absolute;
  top: 5px;
  right: 5px;
  user-select: none;
}
.pre_do pre {
  border-color: #00d100;
}
.pre_do .glyphicon {
  color: #00d100;
}
.pre_dont pre {
  border-color: red;
}
.pre_dont .glyphicon {
  color: red;
}