.productos{
    margin-top: 40px;
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

.productoBOX{
    box-sizing: border-box;
    width: 300px;
    height: 300px;
    background-size: cover;
    background-repeat: no-repeat;
    border: 6px black solid;
}

.flex{
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-basis: 20%;
}

.precio{
    position: absolute;
    width:300px;
    opacity: 0;
    height:300px;
    background-color:rgb(247, 247, 247);
    box-sizing: border-box;    
    border: 6px black solid;
}

.precio span{
    font-size: 50px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    text-align: center;
    color: black;
}

.flex:hover .productoBOX{
    opacity: 0.2;
}

.flex:hover .precio{
    opacity: 1;
}

.productoBOX + span{
    color: black;
    font-size: 30px;
}

@media only screen and (max-width: 980px){
    .footers{
        margin-top: 40px;
    }

    .barraTOP{
        height:80px;
    }   
    .navbar-light {
        background-color: #ffffff;
    }
}