[htpc] {
    
/*
    background-color: lightgray;
*/
    
    margin: 20px;
    
    display: flex;
    flex-direction: column;
    
    align-items: center;
    
}

[htpc] > div {
    
    margin-top: auto;
    margin-bottom: auto;
    
}

[htpc] form {
    
    display: flex;
    flex-direction: column;
    align-items: center;
    
}

[htpc] form div {
    
    display: flex;
    
}

[htpc] form div input[type=checkbox] {
    
    margin-right: 10px;
    
}

[htpc] form button {
    
    margin-top: 20px;
    padding: 10px;
    
}

[htpc] iframe {
    
    width: 100%;
/*
    height: 100%;
*/
    
}