.tab {
  border-collapse: collapse;
  border: 1px solid #fff;
  margin: 30px;
}
.tab td {
  width: 120px;
  height: 40px;
  text-align: center;
  border: 1px solid #ccc;
}
.tab thead {
	background-color: #3c3c3c;
  color: #fff;
}
.upBtn {
  position: relative;
  left: 10px;
  top: -7px;
  display: inline-block;
  width: 0;
  height: 0;
  border-bottom: 10px solid #fff;
  border-top: none;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;
}

.downBtn {
  position: relative;
  left: -9px;
  bottom: -7px;
  display: inline-block;
  width: 0;
  height: 0;
  border-top: 10px solid #fff;
  border-bottom: none;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;
}