productos.css

body{
    font-family: 'Montserrat', sans-serif;
}

header {
    background-color: #BBBBBB;
    padding: 20px 0;
}

.caja {
    width: 940px;
    position: relative;
    margin: 0 auto;
}

nav {
    position: absolute;
    top:110px;
    right: 0;
}

nav li {
    display: inline;
    margin: 0 0 0 15px
}

nav a {
    text-transform: uppercase;
    color: #000000;
    font-weight: bold;
    font-size: 22px;
    text-decoration: none;
}

nav a:hover{
    color: #C78C19;
    text-decoration: underline;
}

.productos{
    width: 940px;
    margin: 0 auto;
    padding: 50px;
}

.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: 2px solid #858585;
    border-radius: 15px;
}

.productos li:hover{
    border-color: #C78C19;
}

.productos li:active{
    border-color: #088C19;
}

.productos h2{
    font-size: 25px;
    font-weight: bold;
}

.productos li:hover h2{
    font-size: 30px;
}

.producto-descripcion{
    font-size: 18px;

}

.producto-precio{
    font-size: 20px;
    font-weight: bold;
    margin-top: 10px;
}

footer{
    text-align: center;
    background: url(imagenes/bg.jpg);
    padding: 40px
}

.copyright{
    color: #FFFFFF;
    font-size: 13px;
    margin: 20px;
}

@media screen and (max-width: 280px){
    .caja, .productos{
        width: auto;
    }

    .productos li{
        display: inline-block;
        text-align: center;
        width: 100%;
        margin: 0 0 10% 0;
        padding: 30px 0px;
        box-sizing: border-box;
        border: 2px solid #000000;
        border-radius: 15px;
    }

    img{
        width: 100%;
        height: auto;
    }

}

@media screen and (max-width: 480px){

    h1{
        text-align: center;
    }
    
    nav{
        text-align: center;
        position: static;
    }

    .caja, .productos{
        width: auto;
    }

    .productos li{
        display: inline-block;
        text-align: center;
        width: 100%;
        margin: 0 0 10% 0;
        padding: 30px 0px;
        box-sizing: border-box;
        border: 2px solid #858585;
        border-radius: 15px;
    }

}