h1 {
    margin: 0.5em auto;
    text-align: center;
    padding: 0 0.2em;
}

iframe {
    width: 80%;
    height: 71em;
    display: block;
    margin: 0 auto;
}

form {
    display: flex;
    flex-direction: column;
    width: 80%;
    margin: 1em auto;
    background-color: #0d1428;
    row-gap: 1em;
}

#lessons_schedule {
    background-color: #fff;
}

.go_back {
    width: 80%;
    margin: 0 auto 0.5em auto;
    padding-left: 1em;
}