Increase size of a answer box or reduce text

I currently have a box included in my form which ask how many people will be travelling.  They can choose from 1 - 8. As you can see on the form you cannot read the number or see the arrows very well.  How do I make this one box bigger so it can be seen properly by the viewer?

Hi again,

Can you add the CSS code below on Designer?

#cid_32 table.form-spinner {

    height : 40px !important;

}

At that situation, it will work properly.

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