Bootstrap-select drop-down list is blocked

problem description

use bootstrap-select as the drop-down box, which is somehow blocked by the input box below.

related codes 

<div class="container container-small">
        <form action="/tea/login.action" method="post">
            <div class="form-group">
                <label></label>
                <div class="input-group" style="overflow: visible;">
                    <div class="input-group-addon">
                        <span class="glyphicon glyphicon-sunglasses" aria-hidden="true"></span>
                    </div>
                    <select id="usertype" style="overflow: visible;" name="usertype" class="selectpicker show-tick form-control"
                        data-live-search="false">
                        <option value="0"></option>
                        <option value="1"></option>
                        <option value="2"></option>
                    </select>
                </div>
            </div>
            <div class="form-group">
                <label></label>
                <div class="input-group">
                    <div class="input-group-addon">
                        <span class="glyphicon glyphicon-user" aria-hidden="true"></span>
                    </div>
                    <input type="text" class="form-control" name="userId" placeholder="Username">
                </div>
            </div>
            <div class="form-group">
                <label></label>
                <div class="input-group">
                    <div class="input-group-addon">
                        <span class="glyphicon glyphicon-lock" aria-hidden="true"></span>
                    </div>
                    <input type="password" class="form-control" name="password" placeholder="Password">
                </div>
            </div>

            <div class="form-group">
                <button type="submit" class="btn btn-primary btn-block"></button>
            </div>
        </form>
    </div>

Occlusion is as follows

clipboard.png

is there a front-end god who can help you solve the problem

Javascript html css
Jul.16,2022

seems to have an appendTo attribute pointing to body. AppendTo= "body" primeng should be like this.
bootstrap-select seems to be container= "body". Take a look at the document

in the current page denomination plus style control, the reason must be CSS conflict, browser debugging mode to see the relationship between the page Elements, debug out. At present, there is a project used in this way, and I debugged it myself. 

<style type="text/css">
.dropdown.bootstrap-select.show-tick.form-control.dicbox.open {
    position: relative;
    z-index: 3;
}
</style>

how did the landlord solve this problem? I also encountered

data-container= "body"

https://www.bootstrapselect.cn/options.html

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bdda80-31373.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bdda80-31373.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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