I use the jquery plugin tablefilter.js to filter html tables. In a specific case (in image below column 9), I use a checkbox filter and i try to reduce it height to match the one of the other controls of the filter row.
When inspecting the specific div containing the filter row I get :
<tr class="fltrow">
<td>
<input id="flt0_demo" type="text" ct="0" class="flt">
</td>
<td>
<input id="flt1_demo" type="text" ct="1" class="flt">
</td>
<td>
<select id="flt2_demo" ct="2" filled="1" class="flt">
<option value="">Clear</option>
<option value="Aff">Aff</option>
<option value="john">john</option>
<option value="DB">DB</option>
<option value="CT">CT</option>
<option value="AG_VIP">AG_VIP</option>
<option value="el">el</option>
<option value="Josef">Josef</option>
<option value="Laura">Laura</option>
<option value="null">null</option>
<option value="REF">REF</option>
<option value="SEO">SEO</option>
</select>
</td>
<td>
<select id="flt3_demo" ct="3" filled="1" class="flt">
<option value="">Clear</option>
<option value="N/A">N/A</option>
<option value="OPEN">OPEN</option>
<option value="PASS">PASS</option>
<option value="REQ">REQ</option>
</select>
</td>
<td>
<input id="flt4_demo" type="text" ct="4" class="flt">
</td>
<td>
<input id="flt5_demo" type="text" ct="5" class="flt">
</td>
<td>
<input id="flt6_demo" type="text" ct="6" class="flt">
</td>
<td>
<select id="flt7_demo" ct="7" filled="1" class="flt">
<option value="">Clear</option>
<option value="BRONZE">BRONZE</option>
<option value="SILVER">SILVER</option>
</select>
</td>
<td>
<select id="flt8_demo" ct="8" filled="1" class="flt">
<option value="">Clear</option>
<option value="BRONZE">BRONZE</option>
<option value="SILVER">SILVER</option>
</select>
</td>
<td>
<div id="chkdiv_9_demo" ct="9" filled="1" class="div_checklist">
<ul id="flt9_demo" colindex="9" class="flt_checklist">
<li class="flt_checklist_item">
<label for="flt9_demo_0">
<input id="flt9_demo_0" name="flt9_demo_0" type="checkbox" value="" data-idx="0">Clear </label>
</li>
<li class="flt_checklist_item">
<label for="flt9_demo_1">
<input id="flt9_demo_1" name="flt9_demo_1" type="checkbox" value="Downgraded" data-idx="1">Downgraded </label>
</li>
<li class="flt_checklist_item">
<label for="flt9_demo_2">
<input id="flt9_demo_2" name="flt9_demo_2" type="checkbox" value="Promoted" data-idx="2">Promoted </label>
</li>
<li class="flt_checklist_item">
<label for="flt9_demo_3">
<input id="flt9_demo_3" name="flt9_demo_3" type="checkbox" value="Stable" data-idx="3">Stable </label>
</li>
</ul>
</div>
</td>
<td>
<input id="flt10_demo" type="text" ct="10" class="flt">
</td>
</tr>
i tried to change the css of the div to set it max row with:
.fltrow {
max-height: 200px; !important;
overflow: auto; !important;
}
but I have no luck. I also checked the plugin methods to see if there was any way to adjust the filterow height, have not found anything.

You can add
CSSto checkbox<div id="chkdiv_9_demo">element as below:(you can always adjust height as per your need)

Below is the output: