You can change the width of each select element by setting a range on it that is generated directly. The code creates a wrapper div with a unique identifier for the uniform-yourid element and the child element with the currently selected parameter. below is css for your specified ids, and you can add.
<style type="text/css">
#uniform-small span
{
width:100px;
text-align:center;
}
#uniform-big span
{
width:200px;
text-align:center;
}
</style>
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