.mb,
.mbt,
.mbb,
.mbl,
.mbr,
.mbtb {
  position: relative;
}
.mb:before,
.mbt:before,
.mbb:before,
.mbl:before,
.mbr:before,
.mbtb:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 200%;
  height: 200%;
  -webkit-transform-origin: 0 0;
  transform-origin: 0 0;
  -webkit-transform: scale(0.5, 0.5);
  transform: scale(0.5, 0.5);
  pointer-events: none;
  z-index: 1;
  border: none;
  border-width: 0;
}
.bd-dotted {
  border-style: dotted;
}
.bd-dashed {
  border-style: dashed;
}
.bd-solid {
  border-style: solid;
}
.bd-none {
  border-style: none;
}
.bd {
  border: none;
  border-style: solid;
  border-width: 1px;
}
.bt {
  border: none;
  border-top-style: solid;
  border-top-width: 1px;
}
.br {
  border: none;
  border-right-style: solid;
  border-right-width: 1px;
}
.bb {
  border: none;
  border-bottom-style: solid;
  border-bottom-width: 1px;
}
.bl {
  border: none;
  border-left-style: solid;
  border-left-width: 1px;
}
.blr {
  border: none;
  border-left-style: solid;
  border-left-width: 1px;
  border-right-style: solid;
  border-right-width: 1px;
}
.btb {
  border: none;
  border-top-style: solid;
  border-top-width: 1px;
  border-bottom-style: solid;
  border-bottom-width: 1px;
}
.bn {
  border: none;
  border-style: none;
  border-width: 0;
}
.mb:before {
  border-width: 1px;
  border-style: solid;
  border-color: #eee;
}
.mbt:before {
  border-top-width: 1px;
  border-style: solid;
  border-color: #eee;
}
.mbb:before {
  border-bottom-width: 1px;
  border-style: solid;
  border-color: #eee;
}
.mbl:before {
  border-left-width: 1px;
  border-style: solid;
  border-color: #eee;
}
.mbr:before {
  border-right-width: 1px;
  border-style: solid;
  border-color: #eee;
}
.mbtb:before {
  border-top-width: 1px;
  border-bottom-width: 1px;
  border-style: solid;
  border-color: #eee;
}