body{
font-family: Arial, sans-serif;
margin:0;
background:#f4f6f9;
}

header{
background:#2c3e50;
color:white;
padding:20px;
text-align:center;
}

nav{
margin-top:15px;
}

nav button{
margin:5px;
padding:10px 15px;
border:none;
background:#3498db;
color:white;
border-radius:5px;
cursor:pointer;
}

nav button:hover{
background:#2980b9;
}

main{
padding:20px;
max-width:900px;
margin:auto;
background:white;
}

section{
display:none;
}

section.active{
display:block;
}

.submenu{
margin:20px 0;
}

.submenu button{
margin:5px;
padding:8px 12px;
background:#16a085;
color:white;
border:none;
border-radius:5px;
}

.subcontent{
display:none;
margin-top:20px;
}

.subcontent.active{
display:block;
}

.download{
display:inline-block;
padding:10px 15px;
background:#27ae60;
color:white;
text-decoration:none;
border-radius:5px;
}

.oracion{
font-size:18px;
line-height:1.6;
}

iframe{
margin-top:15px;
border-radius:8px;
}

/* Responsive */

@media (max-width:700px){

nav{
display:flex;
flex-wrap:wrap;
justify-content:center;
}

nav button{
flex:1 1 40%;
}

}