it shouldnt be each page…just each different sidebar you use if you use a plugin like custom sidebars .
you can either enter each css code for each instance of the widget
or you can give each instance of the widget a certain css id
if you want to give each recent topics widget a certain css id
download the plugin “widget css classes”
in the options of the plugin you can activate “show additional field for id”
then you can just 1 css id for where ever you place the widget
you input your id in the widgets section , in each widgets options
it should show fields to input your custom fields like this
CSS CLASS:
CSS ID:
so if i enter
CSS CLASS:
CSS ID: custom-id
i would have to add this css code
#custom-id ul li {
border-bottom: 1px solid #F1F1F1;
}