.pack_portero{
-webkit-appearance: none;
-moz-appearance: none;
appearance: none;
max-width: 100%;
width: 100%;
border: 1px solid #f5f5f5;
border-radius: 5px;
background-color: #f5f5f5;
box-shadow: none;
color: inherit;
vertical-align: middle;
transition: border-color .5s ease;
height: 48px;
padding: 0 15px;
}