.container {
    max-width: 60em;
}
canvas{
    -moz-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}
.data-kelas {
    page-break-before: always;
}
html {
    position: relative;
    min-height: 100%;
}
@media print {
    .navbar {
        display: none;
    }
}