Input Group Addons make rounded

Created by: anonprophet

      <div class="form-group">
        <div class="input-group">
          <input type="text" name="username" value="" class="form-control input-lg" placeholder="Username" />
          <div class="input-group-addon"><b>LES</b></div>

          <input type="hidden" name="rand" value="LES" />
        </div>
      </div>