/* Estilos generales */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

/* Contenedor principal */
.container {
    width: 100%;
    margin: 0 auto;
    padding: 20px;
}

/* Estilos para dispositivos móviles */
@media only screen and (max-width: 600px) {
    .container {
        padding: 10px;
    }
    .column {
        width: 100%;
        display: block;
        margin-bottom: 20px;
    }
    header, footer {
        font-size: 0.8em;
    }
}

/* Estilos para tablets */
@media only screen and (min-width: 601px) and (max-width: 768px) {
    .column {
        width: 48%;
        display: inline-block;
        margin-right: 2%;
    }
    .column:last-child {
        margin-right: 0;
    }
}

/* Estilos para desktops */
@media only screen and (min-width: 769px) {
    .column {
        width: 30%;
        display: inline-block;
        margin-right: 3.33%;
    }
    .column:last-child {
        margin-right: 0;
    }
}