Increasing the size of inputs in Forms

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Hello there,

I'm currently working on a contact form for a Client using the regular Form block in Concrete5:

http://develop4.warrenit.co.uk/index.php?cID=130...

Right now the Text Area width can be specified, but I can't seem to find where to specify the sizes for the Name, Email & Select Field in order to make those fields wider.

In normal HTML I'd just specify the size of the input.

Is there an easy way to do this in Concrete5?

Any advice appreciated.