GNU/skin/board/work/bo_admin.php
<?php
include_once("./_common.php");

// 저장 처리
if($_POST['act'] == 'save') {
    $x2_1 = $_POST['x2_1'];
    $x2_2 = $_POST['x2_2'];
    $x2_3 = $_POST['x2_3'];
    $bo_4 = $_POST['bo_4'];
    $bo_5 = $_POST['bo_5'];
    $bo_6 = $_POST['bo_6'];
    $bo_7 = $_POST['bo_7'];
    $bo_8 = $_POST['bo_8'];
    $bo_9 = $_POST['bo_9'];
    $sql = "UPDATE {$g5['board_table']} SET 
                bo_4 = '{$bo_4}',
                bo_5 = '{$bo_5}',
                bo_6 = '{$bo_6}',
                bo_7 = '{$bo_7}',
                bo_8 = '{$bo_8}',
                bo_9 = '{$bo_9}',
                x2_1 = '{$x2_1}',
                x2_2 = '{$x2_2}',
                x2_3 = '{$x2_3}'
            WHERE bo_table = '{$bo_table}'";
    sql_query($sql);
    
    echo "<script>
        alert('저장되었습니다.');
        location.href = './bo_admin.php?bo_table={$bo_table}';
    </script>";
    exit;
}
?>

<style>
* { box-sizing: border-box; }

body {
    margin: 0;
    padding: 20px;
    font-family: sans-serif;
    font-size: 14px;
    background: #0a1222;
    color: #c9d6e8;
}

.admin-wrap { max-width: 100%; }

.field-group { margin-bottom: 20px; text-align:center;  }
.field-group ul { all: unset; }
.field-group ul li { all: unset; display: inline-block; }
.field-group ul li:nth-child(1) { float:left; }
.field-group ul li:nth-child(2) { padding-top:7px; }
.field-group ul li:nth-child(3) { float:right; }

.field-group label {
    display: block;
    font-weight: bold;
    margin-bottom: 6px;
    color: #7a9cc5;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 날짜 입력 */
.field-group input[type="time"] {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid #1e3050;
    border-radius: 4px;
    font-size: 13px;
    margin-bottom: 6px;
    background: #0f1e35;
    color: #c9d6e8;
    color-scheme: dark;
}

.field-group input[type="time"]:focus {
    outline: none;
    border-color: #4a7fff;
}
.field-group input {
    width: 655px;
    padding: 8px 10px;
    border: 1px solid #1e3050;
    border-radius: 4px;
    font-size: 13px;
    background: #0f1e35;
    color: #c9d6e8;
    color-scheme: dark;
}

/* textarea */
.field-group textarea {
    width: 100%;
    height: 100px;
    padding: 8px 10px;
    border: 1px solid #1e3050;
    border-radius: 4px;
    resize: vertical;
    font-size: 13px;
    background: #0f1e35;
    color: #c9d6e8;
}

.field-group textarea:focus {
    outline: none;
    border-color: #4a7fff;
}

/* 저장버튼 */
.btn-save {
    width: 100%;
    padding: 10px;
    background: #1a3a6e;
    color: #7ab3ff;
    border: 1px solid #2a5aaa;
    border-radius: 4px;
    font-size: 15px;
    cursor: pointer;
    letter-spacing: 1px;
}

.btn-save:hover {
    background: #4a7fff;
    color: #fff;
    border-color: #4a7fff;
}

/* 달력 펼침 메뉴 */
::-webkit-calendar-picker-indicator {
    filter: invert(0.7) sepia(1) saturate(3) hue-rotate(180deg);
    cursor: pointer;
}
</style>

<div class="admin-wrap">
    <form method="post" action="./bo_admin.php?bo_table=<?php echo $bo_table; ?>">
        <input type="hidden" name="act" value="save">
        <input type="hidden" name="bo_table" value="<?php echo $bo_table; ?>">
        
        <div class="field-group">
            <ul>
                <li><input type="time" name="bo_1" value="<?php echo $board['bo_1']; ?>"></li>
                <li>알람 . 1</li>
                <li><input type="text" name="bo_4" value="<?php echo $board['bo_4']; ?>" placeholder="링크 #1"></li>
            </ul>
            <textarea name="x2_1"><?php echo htmlspecialchars($board['x2_1']); ?></textarea>
        </div>
        
        <div class="field-group">
            <ul>
                <li><input type="time" name="bo_2" value="<?php echo $board['bo_2']; ?>"></li>
                <li>알람 . 2</li>
                <li><input type="text" name="bo_5" value="<?php echo $board['bo_5']; ?>" placeholder="링크 #2"></li>
            </ul>
            <textarea name="x2_2"><?php echo htmlspecialchars($board['x2_2']); ?></textarea>
        </div>
        
        <div class="field-group">
            <ul>
                <li><input type="time" name="bo_3" value="<?php echo $board['bo_3']; ?>"></li>
                <li>알람 . 3</li>
                <li><input type="text" name="bo_6" value="<?php echo $board['bo_6']; ?>" placeholder="링크 #3"></li>
            </ul>
            <textarea name="x2_3"><?php echo htmlspecialchars($board['x2_3']); ?></textarea>
        </div>
        
        <button type="submit" class="btn-save">저장</button>
    </form>
</div>