title: R: shiny: increase width of text input control created by `textInput`
body: <p>I have almost completed a web app, which allows the user to subset the data frame underlying the web app, using the text input control created by <code>textInput</code>; see my <a href="https://stackoverflow.com/questions/21024404/r-evaluate-a-string">related question</a> for parsing the string as an expression.</p>
  
  <p>It would be more user friendly if I could increase the width of this text input control. Does anybody know how to do this?</p>
  
  <p>Cheers for any help.</p>