.contenido{
    padding: 30px 20px;
}

.seccion{
    width: 100%;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    flex-wrap: wrap;
}

.cont-caja{
    width: 400px;
    height: auto;
    margin: 0px 10px 30px 10px;
}

.titulo-vid{
    padding: 20px;
    height: 130px;
    text-align: center;
    display: flex;
    align-items: center;
}

.caja{
    width: 100%;
    height: 300px;
    border: 4px solid #333333; 
    
}

.desc{
    padding: 20px;
    
}