in the current version of Node-RED with default theme, the width of a spinner input field on node's configuration pages cannot be set anymore via CSS properties. This worked in the past (I don't know with which exact version of Node-RED this changed), now all spinner input fields always have the same (large) width, which makes it problematic for some layouts (especially when the spinners are part of an editable list item).
Additional Info: It looks that there is a style specification for spinner input fields which sets the width to 95% with !important declaration. This seems not to be present for e.g. the night-owl dark theme. I can overrule this of course by using also an !important declaration for my spinner element, but should this be the way to go? Any idea why this changed?