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I am a newbie to editing javascript.

I want to set the Max width and height of the popup that QGIS2Web generates with a Leaflet map (I have quite a lot of text in the attributes and will need a scroll bar).

Could someone help me out with the code that I would need to insert in my index.html file?

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2 Answers 2

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Add the following CSS somewhere (either between <style> tags in your main map HTML file within the <head>, or better in a CSS file):

.leaflet-popup-content {
    max-width: 200px;
    height: 200px;
    overflow-y: scroll;
}

enter image description here

Not fully tested - hope it's broadly correct.

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For even more specificity, edit the qgis2web.css file in the RESOURCES sub-directory created by the qgis2web plugin, as shown below. See the changes to height, width and overflow parameters.

enter image description here

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