What is the purpose of the bold line down the left side of every HTML calendar?

Welcome to a calendar layout designed with flexbox:

Check it out here

Do you notice the thicker lines below the heading rows and want to remove them? Here is how you can modify the HTML & CSS code:

#calendars-container {
  text-align: center;
  font-family: Roboto;
  font-size: 9pt;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
}

table.calendar {
  outline: 1px solid #555;
  border-collapse: collapse;
  margin: 0;
}

table.calendar thead {
  background-color: #e6eaef;
}

table.calendar th {
  font-weight: normal;
  line-height: 1.5;
}

table.calendar th.month {
  background-color: #d9d9d9;
  line-height: 1.75;
}

table.calendar td {
  padding: 2px 4px;
}
<!DOCTYPE html>
<html>

&...snip.../>

htmlcssflexboxoutline

Answer №1

While Matt correctly identified the cause of the problem, his proposed solution is not quite right. To resolve the issue, it is recommended to include a 1px margin on the right and bottom of every calendar table.

table.calendar {margin: 0 1px 1px 0;}

Answer №2

Consider replacing the outline property with a border and applying a negative margin to .calendar:

#calendars-container {
  text-align: center;
  font-family: Roboto;
  font-size: 9pt;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
  margin:1px 0 0 1px; /* To compensate for the margin .calendar */
}

table.calendar {
  border: 1px solid #555; /* 👈 */
  margin: -1px 0 0 -1px; /* 👈 */
  border-collapse: collapse;
}

table.calendar thead {
  background-color: #e6eaef;
}

table.calendar th {
  font-weight: normal;
  line-height: 1.5;
}

table.calendar th.month {
  background-color: #d9d9d9;
  line-height: 1.75;
}

table.calendar td {
  padding: 2px 4px;
}
<!DOCTYPE html>
<html>

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="preconnect" href="https://fonts.googleapis.com">
  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
  <link href="https://fonts.googleapis.com/css2?family=Roboto&display=swap" rel="stylesheet">
</head>
<html>

<body>
  <div id="calendars-container">

    <table class="calendar">
      <thead>
        <tr>
          <th class="month" colspan="7">June&nbsp;2023</th>
        </tr>
        <tr>
          <th abbr="S">S</th>
          <th abbr="M">M</th>
          <th abbr="T">T</th>
          <th abbr="W">W</th>
          <th abbr="T">T</th>
          <th abbr="F">F</th>
          <th abbr="S">S</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td colspan="4">&nbsp;</td>
          <td>1</td>
          <td>2</td>
          <td>3</td>
        </tr>
        <tr>
          <td>4</td>
          <td>5</td>
          <td>6</td>
          <td>7</td>
          <td>8</td>
          <td>9</td>
          <td>10</td>
        </tr>
        <tr>
          <td>11</td>
          <td>12</td>
          <td>13</td>
          <td>14</td>
          <td>15</td>
          <td>16</td>
          <td>17</td>
        </tr>
        <tr>
          <td>18</td>
          <td>19</td>
          <td>20</td>
          <td>21</td>
          <td>22</td>
          <td>23</td>
          <td>24</td>
        </tr>
        <tr>
          <td>25</td>
          <td>26</td>
          <td>27</td>
          <td>28</td>
          <td>29</td>
          <td>30</td>
          <td colspan="1">&nbsp;</td>
        </tr>
      </tbody>
    </table>
...
// Omitted remaining calendar tables

  </div>
</body>

</html>

Answer №3

You may be facing an issue where your 1px borders are creating a 2px border space due to their alignment. An effective solution is to eliminate the outline, introduce a 1px gap on #calendars-container, and utilize box-shadow to simulate the borders. Since box-shadow is drawn inside the element, it allows for overlapping:

#calendars-container
{
    text-align: center;
    font-family: Roboto;
    font-size: 9pt;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: stretch;
    gap: 1px;
}

table.calendar
{
    border-collapse: collapse;
    margin: 0;
    box-shadow: 0 0 0 1px #000;
}

https://jsfiddle.net/e6y9nkd8/

#calendars-container
{
  text-align: center;
  font-family: Roboto;
  font-size: 9pt;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
  gap: 1px;
}

table.calendar
{
  border-collapse: collapse;
  margin: 0;
  box-shadow: 0 0 0 1px #000;
}

table.calendar thead {
  background-color: #e6eaef;
}

table.calendar th {
  font-weight: normal;
  line-height: 1.5;
}

table.calendar th.month {
  background-color: #d9d9d9;
  line-height: 1.75;
}

table.calendar td {
  padding: 2px 4px;
}
<!DOCTYPE html>
<html>

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="preconnect" href="https://fonts.googleapis.com">
  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
  <link href="https://fonts.googleapis.com/css2?family=Roboto&display=swap" rel="stylesheet">
</head>
<html>

<body>
  <div id="calendars-container">

    <table class="calendar">
      <thead>
        <tr>
          <th class="month" colspan="7">June&nbsp;2023</th>
        </tr>
        <tr>
          <th abbr="S">S</th>
          <th abbr="M">M</th>
          <th abbr="T">T</th>
          <th abbr="W">W</th>
          <th abbr="T">T</th>
          <th abbr="F">F</th>
          <th abbr="S">S</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td colspan="4">&nbsp;</td>
          <td>1</td>
          <td>2</td>
          <td>3</td>
        </tr>
        <tr>
          <td>4</td>
          <td>5</td>
          <td>6</td>
          <td>7</td>
          <td>8</td>
          <td>9</td>
          <td>10</td>
        </tr>
        <tr>
          <td>11</td>
          <td>12</td>
          <td>13</td>
          <td>14</td>
          <td>15</td>
          <td>16</td>
          <td>17</td>
        </tr>
        <tr>
          <td>18</td>
          <td>19</td>
          <td>20</td>
          <td>21</td>
          <td>22</td>
          <td>23</td>
          <td>24</td>
        </tr>
        <tr>
          <td>25</td>
          <td>26</td>
          <td>27</td>
          <td>28</td>
          <td>29</td>
          <td>30</td>
          <td colspan="1">&nbsp;</td>
        </tr>
      </tbody>
    </table>
    ...
    <!-- Repeat similar table structures for different months -->
   </div>
</body>

</html>

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