Is it able to change width of selects inputs at report configuration?

[Lumbermash]

Hi, I have a problem when im configurating a report from a plugin that I have. The report has properties at atlassian-plugin.xml, and with the knowledge that I actually have I couldn't find a way to change the width of those properties, because its Atlassian code. So I tryed to add a resource at my report with a js, which changes width.style into auto, to make it bigger or lower depending on the values of the select. But I couldn't make it work... I saw that there isn't a velocity template where I can change styles so I don't know what else try. And thats why Im here asking for some help. Thing that I will really apreciate. Below I show you the parts of the code that i was talking about:

Next is the report from the atlassian-plugin.xml:

<report key="xxxx" i18n-name-key="xxxxx" name="xxxx"
  class="xxxx">
  <description key="xxxx">xxxx</description>
  <label key="xxxx" />
  <resource type="velocity" name="view" location="xxxx" />
  <resource type="velocity" name="excel" location="xxxx" />
  <resource type="i18n" name="i18n" location="xxxx" />
  <resource name="select-browser-autosize.js" type="download" location="xxxx/select-browser-autosize.js"></resource>
  <properties>
    <property>
      <key>labels</key>
      <name>xxxx</name>
      <description>xxxx</description>
      <type>select</type>
      <values class="xxxx" />
    </property>
  <properties>
<report>

Next its the js file content, I searched at the created code and the id that is put at this select is this one so I changed the width of it:

document.getElementById("labels_select").style.width="auto"

 If you need some more information don't worry about ask, I really apreciate any help.

Thanks.