[SOLVED] Is there a way to have different font sizes on desktop and mobile?

There are a few ways of going about this depending on what you want to change. You could start with these (adjust the values as desired):

/* body font for Editing and Reading views */
.is-phone :is(.markdown-source-view, .markdown-preview-view) {
    font-size: 1.2em;

/* sidebar font and smaller font in search & backlinks results, etc */
.is-phone {
    --nav-item-size: 18px;
    --font-ui-smaller: 15px;

Here are some links to check out:

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