*{
    margin: 0;
    padding: 0;
    box-sizing: border-box; 
}

.contenedor {
    display: flex;
    flex-direction: column;
    min-height: 100vh; 
    background: gold;
}

.encabezado {
    background: blue;
    color: azure;
    padding: 25px;
    text-align: center;
}

.contenido {
    display: flex;
    justify-content: space-between;
    flex: 1;
    background: lightcyan;
    padding: 10px;
}

.texto1 {
    padding: 15px; 
    margin: 10px; 
    background: lightcoral;
    border: 1px solid black; 
    box-shadow: 5px 5px rgba(0, 128, 0, 1);  
    flex: 1;  
    width: 48%; 
    height: 200px;  
}

.pie {
    background: gray;
    color: white;
    text-align: center;
    padding: 15px;
}

@media(max-width:500px)
{
    .contenido {
        flex-direction: column; 
    }
    .texto1 
    {
        width: 100%;
    }
}