.cabezera-tienda {
    border-top: 1px solid black;
    border-bottom: 1px solid black;
    text-align: center;
    margin: 100px,0;
    padding: 40px;
    font-size: 3vh;
}
.productos {
    display: flex;
    align-content: center;
}
.articulo {
    flex-direction: column;
    flex-basis: 50%;
    text-align: center;
}
.agregar-carro {
    display: inline;
    border: 1px solid black;
    font-size: 2vh;
    font-style: black;
    color: rgb(255, 255, 255);
    background-color: black;
}
.agregar-carro:hover {
    border: 6px solid rgb(255, 230, 0);
    background-color: rgb(255, 230, 0);
    color: black;
 }
img {
    width: 20vw;
    flex-basis: 1%;
}
.paginas {
    display: flex;
    justify-content: flex-end;
    align-items: center;
}
.paginas p {
    display: inline-block;
    padding: 10px;
    border: 1px solid black;
    background-color: black;
    color: rgb(255, 255, 255);
    margin: 10px;
    border-radius: 100%;
    /* ajusta los parrafos */
}
.paginas p:hover {
    border: 5px solid rgb(255, 230, 0);
    background-color: rgb(255, 230, 0);
    color: black;
 }