.tabel_merah {
  border:  1px solid red;
  background-color:#ffe2e2;
}

/* arrow keatas */
.popup {
  float: left;
  width: auto;
  background: #ad1313;
  padding: 4px;
  border-radius: 2px;
  color: #FFF;
  position: relative;
  font-size: 12px;
  line-height: 20px;
}
  .popup:after{ /* arrow keatas */

  content:'';
  display:block;
  position:absolute;
  top:100%; /*should be set to 100% */
  left:30px;
  width:0;
  height:0;
  border-color: #ad1313 transparent transparent transparent; /*border color should be same as div div background color*/
  border-style: solid;
  border-width: 10px;
}
/* arrow keatas */