selectboxの下に隙間ができてしまう

Question

このようにselectboxの下に隙間ができてしまいます．
考えられる原因や対策など，ありますでしょうか．

環境はGooglechromeです．

<tr>
    <td>
        <span class="input_title">グループ名</span>
        <div class="input_note_wrapper">
                <select class="filter_select2" id="group_sel" name="group_id" style="font-size:medium;">
                    <option value="0" selected >未選択</option>
                    @if(isset($data['project_info']->group))
                        @foreach($data['group'] as $key => $value)
                            <option value="{{{$value->group_id}}}" @if(old('group_id')==$value->group_id || $data['project_info']->group_id == $value->group_id)) selected @endif>{{$value->name}}</option>
                        @endforeach
                    @else
                        <option value selected disabled>選択</option>
                        @foreach($data['group'] as $key => $value)
                            <option value="{{{$value->group_id}}}" @if(old('group_id')==$value->group_id) selected @endif>{{$value->name}}</option>
                        @endforeach
                    @endif
                </select>
                <a data-id='' class="button_add" href="#popup-client-group-add" rel="modal:open">
                    <img src="{{ asset("home/images/add_blue.png") }}" class="add_btn">
                </a>
        </div>
    </td>
</tr>

<script>
    $(document).ready(function() {
    $('.filter_select2').select2({
        dropdownAutoWidth: true,
        width: '250px',
    });
});
</script>

.error {
    border-color:red;
}

.add_table .error {
    border: 1px solid red;
}
.radio-inline{
    display: inline-block;
    margin-bottom: 0;
    font-weight: normal;
    vertical-align: middle;
    cursor: pointer;
    width: 50px;
}
.radio-inline input{
    margin-top: 10px;
}

.add_table .combo-select {
    float: left;
    position: relative;
    font: 100% Helvetica, Arial, Sans-serif;
    border: 2px #ccc solid;
    border-radius: 2px;
    width: 120px;
}

.demo{width:100%;}
    .select_side{float:left; width:300px;}
    .select_side p{margin: 5px;padding: 5px;line-height: 30px; height: 30px;}
    #selectR{width:300px;}
    #selectL{width:300px;}
    .select_opt{float:left; width:40px; height:100%; margin-top:36px}
    .select_opt p{width:26px; height:26px; margin-top:6px; background:url(/images/arr.gif) no-repeat; cursor:pointer; text-indent:-999em}
    .select_opt p#toright{background-position:2px 0}
    .select_opt p#toleft{background-position:2px -22px}
    .sub_btn{clear:both; height:42px; line-height:42px; padding-top:10px; text-align:center}

    #search_pdf_list_image:hover{cursor: pointer;}
    #search_pdf_list_image:active{filter:alpha(opacity=50); -moz-opacity:0.5;
           -khtml-opacity: 0.5;  opacity: 0.5; }
    .user_select{
        padding: 3px 5px;
        height: 250px;
    }
    .user_select option {
        padding: 3px 0px
    }
.person .select_large {
    width: 28%;
}
#project_add_table{
    border: none;
}

#form .money{
    text-align: right;
} 

.order_dept_cost_sub{
    background: rgb(238, 238, 238);
    border-radius: 5px;
    display: inline-block;
    font-weight: normal;
    padding: 5px 10px;
    margin-left: 10px;
}

#order_project_name{
    background: transparent;
    border: none;
    font-size: 13px;
    font-weight: bold;
    outline: none;
}

.js-children-table{
    padding-top: 0;
    margin: 5px;
    width:100%;
}

.js-children-table h3{
    color: #333333;
}

.child_body{
    border-left: 2px #e6ecf3 double;
    display: block;
}

.child_button{
    background: white;
    border:none;
    color: #333333;
    cursor: pointer;
    float: right;
    font-size: 1em;
    margin-right: 25px;
}

.child_border{
    border:1px solid #e6ecf3;
    width: 98.8%;
}

#relation_text{
    font-size: 0.25rem;
    margin: 15px 35px 0;
}

#relation_text .myself{
    font-weight: bold;
}

#relation_text .relation_child{

}

#relation_text .relation_grand_child{
    
}

#relation_text li{
    margin-bottom: 7px;
}

#relation_text li a{
    text-decoration: underline;
}

#no_relation_text{
    margin: 15px 35px 0;
}

.title_item{
    color: red;
    font-size: 5px;
}

.title_input{
    width: 7.5em;
    font-weight: bold;
    line-height: 2em !important;
    margin: .5em 0 0 0;
    text-align-last:justify;
}

.error_message{
    background: #FADBDA;
    color: red;
    padding: 5px 30px 5px;
}

#costomerInfo{
    margin: 0px 0px 8px;
    width: 940px;
    height: 170px;
}
.select2-dropdown{
    font-size: medium;
}

.select2-selection__arrow b{
    display: none;
}
.select2-results li{
    border-radius: 0;
    border: none;
}
.select2-search{
    font-size: medium;
}
.rep td span{
    min-height: 0;
    line-height: 0;
}
.laborCostSum td span{
    line-height: 0.6em;
}
.select2-selection__rendered{
    display: block;
    width: 210px;
    padding-top: 2px;
}
#project_status{
    height: 35px;
}
.datepicker_month{
    padding-left:10px;
}
.input_short {
    text-align: center;
}
.rep .select2-selection__rendered{
    display: block;
    width: 210px;
    padding-top: 0px;
}

#既に試したこと

*{
  padding: 0px;
  margin: 0px;
}

変化なし

<span class="dropdown-wrapper" aria-hidden="true"></span>

の開発者モードで該当箇所を削除
隙間を消すことはできたが，もちろんリロードするとまた隙間ができる．

Answer 1

/* スタイルシート */
*{
  padding: 0px;
  margin: 0px;
}

Comments

[rikutennis]

変化ありませんでした