Hi!
The close icon cannot be changed, as it is an SVG icon, but you can change all the colors as you need, here: https://i.imgur.com/QNujWQv.png
The width of the drop-down, depends on the columns, where the width is 200px by default. You can however change that as well as, try the “block” layout, where the width will be the same as the container: https://i.imgur.com/5DIPF10.png
