Table cell formatting

Well spotted! I think I just concentrated on ensuring that the blue background worked!

Try:

.planner {
    th {
        background: lightgrey !important;
    }
    tr:nth-child(odd) {
        background: lightblue;
        font-weight: bold;
    }
}

There's a bit more information about using custom css in Joplin here.

At this time custom css is limited to the desktop clients. I do not know if it would even be possible to implement on the mobile clients (I am not a dev just another user).

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