Changing the width of the drop-down menu

I am also unable to change the width of the 'your event' input field.

Hello there,

Regarding the drop-down field of your form, please log in to your JotForm form builder and go to designer:

In Designer, just click on that drop-down field, and change the width of it:

You can change that to whatever fits your needs. And now we should center that drop-down. To do that just input this in your CSS:

#cid_80 {
    max-width : none !important;
}

And instead of this css for drop-down:

#input_80 {
    margin : 0px 0px 0px 240px;
    font-size : 25px;
    width : 300px;
}

Change margin to be like this:

#input_80 {
    margin : 0px 0px 0px 0px;
    font-size : 25px;
    width : 300px;
}

Please try, and let me know if it helps, I tested and it looks like this after those adjustments:

Best regards,