#dentro {
    text-align: justify;
}
#principal {
    margin-left: 5%;
    margin-right: 5%;
    display: flex;
}

#fora{
    display: block;
    margin-right: 8%;
    margin-left: 8%;
}

body{
    background-color: #DDDDDD;
    font-family: sans-serif;
}

h1,h2{
    text-align: center;
}