.cuerpo{
width: 100%;
height: 100%;
}
.contenedor{
width: 50%;
}
.ventana{
width: 100%;
height: 100%;
display: flex;
justify-content: center;
align-items: center;
}
.sub_ventana{
position: absolute;
margin:0;
width: 100%;
max-width: 1300px;
height: 100%;
}
.iframe_video{
position: absolute;
width: 100%;
height: 100%;
}
.parrafo{
background: aqua;
}
@media(max-width: 773px){
.contenedor{
width: 100%;