убрать стрелки вверх вниз в select

select { 
  -webkit-appearance: none; 
  -moz-appearance: none; 
} 
 
select::-ms-expand { 
  display: none; 
}

<select> 
  <option value="">Option 1</option> 
  <option value="">Option 2</option> 
</select>

select { 
  -webkit-appearance: none; 
  -moz-appearance: none; 
  appearance: none; 
}

<select name="day" id="day" class="day_order"> 
	<option value="" selected >Все</option> 
	<option value="" >Понедельник</option> 
</select>