'Odoo - CSS changes are not applied

I am trying to make changes to an existing CSS file. However, the changes are not applied when I restart Odoo. The CSS file is included in the XML file as follows:

 <template id="asset_contacts_addon" name="contacts addon assets" inherit_id="web.assets_backend">
        <xpath expr="." position="inside">
            <link rel="stylesheet" type="text/css" href="/contacts_addon/static/src/css/contacts_addon.css"/>
        </xpath>
    </template>

And my CSS file looks lik this:

#contacts_checkbox_message {
  color: red;
}

.dropdown-menu{
    overflow-y: scroll !important;
    height: 200px !important;
}

I was working on the dropdown-menu. I have tried to make the changes visible in Odoo, but when I restart the service, my changes are not applied. The changes were only applied when I deleted my test database and created a new one. How can I apply the changes without deleting my database ?



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