.productos li{
display: inline-block;
text-align: center;
width: 30%;
vertical-align: top;
margin: 0 1.5%;
padding: 30px 20px;
box-sizing: border-box;
border-color: rgb(14, 14, 14);
border: 3px solid rgb(14, 14, 14);
border-radius: 10px;
}