.combo-select {
  height: 100%;
  border: none;
  border-radius: 0;
  margin: 0;
}
.combo-input {
  width: 100%;
  height: 100%;
  padding: 0 0 0 14px;
  font-size: 16px;
  letter-spacing: 1px;
  color: #999999;
  background-color: transparent;
}
.combo-arrow:before {
  width: 10px;
  height: 10px;
  border-left: 2px solid #999;
  border-bottom: 2px solid #999;
  border-right: none;
  border-top: none;
  /* transform    : rotate(135deg) translateY(-5px); */
  transform: translateY(0px) rotate(-45deg);
  transition: all 0.3s;
}
.combo-open .combo-arrow:before {
  transition: all 0.3s;
  border-bottom: 2px solid #999;
  transform: translateY(5px) rotate(135deg);
}