Huge accordion icons on iPhone

It looks like you’re using the plugin’s minimal theme, which means all of the plugin’s CSS is left out / not applied. The minimal theme is meant for developers who want to supply all the CSS themselves.

You could switch to one of the other plugin themes. If you stay with the minimal theme, adding the following CSS should fix it for you:

.plethoraplugins-accordion.plethoraplugins-theme__minimal .pds-accordion__icon?{ width: 1rem; height: 1rem; }