How to Resize a List Lookup Control

Hi,

I'm using the classic forms in O365 to design a form. I have a requirement to resize the list lookup control to fit into a table. I tried the below suggestion found on the forum but it didn't resize.

1. Navigate into the Settings of your List Control
   1. Under the Formatting tab, set the CSS class to 'someClass'
   2. Save.
2. Navigate into form Settings > Custom CSS and add the following:

.someClass {

    width: 50px !important;

}

Any idea on how this can be done?

Regards,

Kavirana