Table with sticker headers: Scrolling hides the border-top and border-bottom of the table headers

Question

I have the following example: https://plnkr.co/edit/05Hef47dumxZopRT

Initial the table looks ok, but when the table gets scrolled vertically, the border of the header cells gets hidden.

The header cells are styled with this class:

    .fixed_headers thead th {
      position: sticky;
      position: -webkit-sticky;
      top: 0;  /* REQUIRED: https://stackoverflow.com/a/43707215 */
      background-color: #efefef;
      z-index: 10;
      border: 1px solid #ccc;
      box-sizing: border-box;
      -moz-box-sizing: border-box;
      -webkit-box-sizing: border-box;
      background-clip: padding-box;
    }

How is it possible that the header cell's borders will be displayed if it the table will be scrolled?

Answer 1

You can reset the top coordonate and add a box-shadow to blend with the table border or overlay the background while scrolling:

possible update:

.fixed_headers thead th {
          position: sticky;
          top: 1px;  /* REQUIRED: https://stackoverflow.com/a/43707215 */
          background-color: #efefef;
          z-index: 10;
          border: 1px solid #ccc; 
            box-shadow:0 -1px #ccc;
        }

demo snippet below:

 html * { font-family: Arial, Helvetica, sans-serif; font-size: 12px; }.responsive-table-container { height: 300px; width: 800px; overflow: auto; } table { border-collapse: collapse; }.fixed_headers { width: 100%; }.fixed_headers thead tr { position: relative; }.fixed_headers td, .fixed_headers thead th { padding: 5px; text-align: left; white-space: nowrap; }.fixed_headers tbody tr:nth-child(even) { background-color: #f7f7f7; color: #000; }.fixed_headers thead th { position: sticky; top: 1px; /* REQUIRED: https://stackoverflow.com/a/43707215 */ background-color: #efefef; z-index: 10; border: 1px solid #ccc; box-shadow: 0 -1px #ccc, 0 1px #ccc; } tbody td { border: 1px solid #ccc;

 <div class="responsive-table-container"> <table class="fixed_headers"> <thead> <tr> <th>Column 1</th> <th>Column 2</th> <th>Column 3</th> <th>Column 4</th> <th>Column 5</th> <th>Column 6</th> <th>Column 7</th> <th>Column 8</th> <th>Column 9</th> <th>Column 10</th> <th>Column 11</th> <th>Column 12</th> <th>Column 13</th> <th>Column 14</th> <th>Column 15</th> <th>Column 16</th> <th>Column 17</th> <th>Column 18</th> <th>Column 19</th> <th>Column 20</th> </tr> </thead> <tbody> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> <tr> <td>Value 1</td> <td>Value 2</td> <td>Value 3</td> <td>Value 4</td> <td>Value 5</td> <td>Value 6</td> <td>Value 7</td> <td>Value 8</td> <td>Value 9</td> <td>Value 10</td> <td>Value 11</td> <td>Value 12</td> <td>Value 13</td> <td>Value 14</td> <td>Value 15</td> <td>Value 16</td> <td>Value 17</td> <td>Value 18</td> <td>Value 19</td> <td>Value 20</td> </tr> </tbody> </table> </div>