Customizing Card Background Colors Based on Difficulty Levels

You can try the following:

Template

<div class="background-layer {{Tags}}"></div>

Note: It does not matter where this <div> element is placed within the template.

Styling

.background-layer {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: -1;
}

.beginner {
    background-color: lightblue;
}

.intermediate {
    background-color: lightcoral;
}

.advanced {
    background-color: lightgreen;
}


Relevant thread:

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