.principal{
    text-align:left;
    margin-bottom:15px; 
    width:95%;
    border: 0; /*1px groove rgb(13,49,128);*/
    border-radius:15px;
    padding-top:10px;
    padding-bottom:10px;
    padding-left:15px;
    padding-right:15px;
    width:100%;
}
.list_product{
    text-align:center;
    padding:5px;
    float:right;
    width:97%;
    margin-right:35px;
}
.list_product th{
    padding-left:20px;
    padding-right:20px;
}
.line_tr:hover{
    background-color: #DDDDDD;
}