Want to increase width of specific column in table php

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Here are the columns like student id, student name and question 1 etc. I want to increase the width of column "question". How can i? i tried add width through adding object in table header tag like width="100", it does work at simple html code but doesn't work here in my required code  <?php                     if (isset($result_display)) {                         echo "<p><u>Result</u></p>";                         if ($result_display == 'No record found !') {                             echo $result_display;                         } else {                             echo "<table class='result_table'>";                             echo '<tr><th>Student ID</th><th>Student Name</th><th>Question#1</th><th>Answer#1</th><th>Question#2</th><th>Answer#2</th><th>Question#3</th><th>Answer#3</th><th>Question#4</th><th>Answer#4</th><th>Question#5</th><th>Answer#5</th><th>Question#6</th><th>Answer#6</th><th>Question#7</th><th>Answer#7</th><th>Question#8</th><th>Answer#8</th><th>Question#9</th><th>Answer#9</th><th>Question#10</th><th>Answer#10</th><th>Question#11</th><th>Answer#11</th><th>Question#12</th><th>Answer#12</th><th>Question#13</th><th>Answer#13</th><th>Question#14</th><th>Answer#14</th><th>Question#15</th><th>Answer#15</th><tr/>';                             foreach ($result_display as $value) {                                 echo '<tr>' . '<td class="e_id">' . $value->id . '</td>' .'<td class="name">' . $value->Student_name . '</td>' . '<td>' . $value->question1 . '</td>' . '<td class="j_date">' . $value->Answer1 . '</td>' . '<td>' . $value->question2 . '</td>' . '<td class="mob">' . $value->Answer2 . '</td>' . '<td >' . $value->question3 . '</td>' . '<td>' . $value->Answer3 . '</td>' . '<td>' . $value->question4 . '</td>' . '<td>' . $value->Answer4 . '</td>' . '<td>' . $value->question5 . '</td>' . '<td>' . $value->Answer5 . '</td>' . '<td>' . $value->question6 . '</td>' . '<td>' . $value->Answer6 . '</td>' . '<td>' . $value->question7 . '</td>' . '<td>' . $value->Answer7 . '</td>' . '<td>' . $value->question8 . '</td>' . '<td>' . $value->Answer8 . '</td>' . '<td>' . $value->question9 . '</td>' . '<td>' . $value->Answer9 . '</td>' . '<td>' . $value->question10 . '</td>' . '<td>' . $value->Answer10 . '</td>' . '<td>' . $value->question11 . '</td>' . '<td>' . $value->Answer11 . '</td>' . '<td>' . $value->question12 . '</td>' . '<td>' . $value->Answer12 . '</td>' . '<td>' . $value->question13 . '</td>' . '<td>' . $value->Answer13 . '</td>' . '<td>' . $value->question14 . '</td>' . '<td>' . $value->Answer14 . '</td>' . '<td>' . $value->question15 . '</td>' . '<td>' . $value->Answer15 . '</td>' .   '<tr/>';                             }                             echo '</table>';                         }                     }                     ?>                 </div>             </div>             <?php