What wrong with this code, why javascript code doesn't work

Question

Help me
https://code.sololearn.com/WwnSdH7PZl0L/?ref=app

Answer 1

.card that you rry to toggle in display is inside the drop-down – which is always hidden (specified in the css)

Answer 2

There are two method u can do so ..

1.
.appear
{
display: block !important;
}

Or

2.

.drop-down ul.appear
{
display: block;
}