У внутренних дивов нет границ, а надо.
<div class="col product">
<div class="row product_inside">
<div class="col col-md-auto" ><img class="product_inside" src="images/dev/office.png"></div>
<div class="col" >Административное освещение</div>
</div>
<div class="row product_inside">
<div class="col product_inside">
<select multiple style="width: 240px; height:260px;">
<option>test</option>
<option>test</option>
<option>test</option>
<option>test</option>
</select>
</div>
<div class="col product_inside"><img src="images/dev/office_big.png" style="width: 240px; height:260px;"></div>
</div>
</div>
.menu_podbora_col
{
padding: 0px;
}
.menu_podbora
{
border: 1px solid gray;
text-align: center;
}
.menu_podbora_left
{
border-left: 1px solid gray;
padding: 0px;
}
.product
{
margin: 5px;
border: 1px solid gray;
padding-left: 0px;
padding-right: 0px;
}
.
.product_inside
{
border: 1px solid black;
padding-left: 0px;
padding-right: 0px;
}