In some circumstances, you may want to increase the font size of your OSMap HTML sitemap for narrow devices.

This is a two-step process:

1. Create a custom.css file for your template
2. Add new CSS rules to this custom.css.

Let's take a look at this process in more detail.

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Step #1. Create a custom.css file for your template

In my example, I will use the JS Alasse template.

• In your Joomla administrator panel, go to "Extensions" > "Templates" > "Templates":

• You will see the "Templates: Templates (Site)" screen, as shown in the next image. Click "Js_alasse Details and Files":

• You will be taken to the "Templates: Customize (Js_alasse) as you can see in the next image. Click "css":

• You will see the dropdown list of the sub-folders and files, contained inside the "css" folder of the JS Alasse template. Click "New File":

• This will bring up the "Create or Upload a New File" box. Click "css":

• Enter "custom" in the "File Name" box, select "css" from the "Select a file type" field and click "Create":

• You will see the "File created" message, confirming that you successfully created your custom.css file for JS Alasse custom CSS rules:

Good job! You are ready to move to the next step.

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Step #2. Add new CSS rules to this custom.css

• Add to the newly created custom.css file the following CSS code:

@media only screen and (max-width: 600px) {

   .osmap-items ul {
      margin: 10px 0 10px 25px;
      font-size: larger;
     }

    .osmap-items li {
       padding: 10px;
     }
}

• Click "Save" or "Save & Close".