.gallery_product
{
    margin-bottom: 30px;
}
.gallery-wrapper .btn-default{
    min-width: 20px;
    padding: 10px;
    color: white;
    font-size: 18px;
    
}
.gallery-wrapper .btn-default:hover{
    color: black;
    background-color: darkblue;
    transition: none;
}