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CSS

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About CSS Base

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HTML 

              
                <figure class="table-wrapper">
  <figcaption id="caption">
    <h1>Consultation schedule</h1>
  </figcaption>

  <table aria-labelledby="caption" class="table-full">
    <thead>
      <tr>
        <th></th>
        <th>Nov 7</th>
        <th>Nov 8</th>
        <th>Nov 9</th>
        <th>Nov 10</th>
        <th>Nov 11</th>
      </tr>
    </thead>

    <tbody>
      <tr>
        <th>09:00 - 10:00</th>
        <td><span class="block-1">
            Project 1
          </span></td>
        <td></td>
        <td><span class="block-2">
            Project 2
          </span></td>

        <td><span class="block-3">
            Project 3
          </span></td>
        <td></td>
      </tr>
      <tr>
        <th>10:00 - 11:00</th>
        <td></td>
        <td> <span class="block-3">
            Project 3
          </span></td>
        <td> <span class="block-4">
            Project 4
          </span></td>
        <td></td>
        <td>
          <span class="block-1">
            Project 1
          </span>
        </td>
      </tr>
      <tr>
        <th>11:00 - 12:00</th>
        <td><span class="block-4">
            Project 4
          </span></td>
        <td><span class="block-2">
            Project 2
          </span></td>
        <td></td>
        <td><span class="block-1">
            Project 1
          </span></td>
        <td></td>
      </tr>
    </tbody>
    <table>

        <ol class="list">
          <li>
            <strong>Today</strong>
            <div>
              <ol>
                <li>
                  <div>
                    09:00 - 10:00
                  </div>
                  <div>
                    <span class="block-1"> Project 1</span>
                  </div>
                </li>
                <li>
                  <div>
                    11:00 - 12:00
                  </div>
                  <div>
                    <span class="block-4"> Project 4</span>
                  </div>
                </li>
              </ol>

            </div>
          </li>
          <li>
            <strong>Nov 8</strong>
            <div>
              <ol>
                <li>
                  <div>
                    10:00 - 11:00
                  </div>
                  <div>
                    <span class="block-3"> Project 3</span>
                  </div>
                </li>
                <li>
                  <div>
                    11:00 - 12:00
                  </div>
                  <div>
                    <span class="block-2"> Project 2</span>
                  </div>
                </li>
              </ol>

            </div>
          </li>
        </ol>

        <table class="table-map" aria-labelledby="caption">
          <thead>
            <tr>
              <th></th>
              <th>07.11.</th>
              <th>08.11.</th>
              <th>09.11.</th>
              <th>10.11.</th>
              <th>11.11.</th>
            </tr>
          </thead>

          <tbody>
            <tr>
              <th>Project 1</th>
              <td><span class="block-1"></span></td>
              <td><span class="block-empty"></span></td>
              <td><span class="block-empty"></span></td>
              <td><span class="block-1"></span></td>
              <td><span class="block-1"></span></td>
            </tr>
            <tr>
              <th>Project 2</th>

              <td><span class="block-empty"></span></td>
              <td><span class="block-2"></span></td>
              <td><span class="block-2"></span></td>
              <td><span class="block-empty"></span></td>
              <td><span class="block-empty"></span></td>
            </tr>
            <tr>
              <th>Project 3</th>
              <td><span class="block-empty"></span></td>
              <td><span class="block-3"></span></td>
              <td><span class="block-empty"></span></td>
              <td><span class="block-3"></span></td>
              <td><span class="block-empty"></span></td>
            </tr>
            <tr>
              <th>Project 4</th>

              <td><span class="block-4"></span></td>
              <td><span class="block-empty"></span></td>
              <td><span class="block-4"></span></td>
              <td><span class="block-empty"></span></td>
              <td><span class="block-empty"></span></td>
            </tr>
          </tbody>
        </table>
</figure>
!

CSS 

              
                /* @link https://utopia.fyi/type/calculator?c=1280,18,1.333,1700,26,1.333,5,2,&s=0.75|0.5|0.25,1.5|2|3|4|6,s-l */

:root {
  --step--2: clamp(0.63rem, calc(0.07rem + 1.88vw), 0.91rem);
  --step--1: clamp(0.84rem, calc(0.09rem + 2.5vw), 1.22rem);
  --step-0: clamp(1.13rem, calc(0.13rem + 3.33vw), 1.63rem);
  --step-1: clamp(1.5rem, calc(0.17rem + 4.45vw), 2.17rem);
  --step-2: clamp(2rem, calc(0.22rem + 5.93vw), 2.89rem);
  --step-3: clamp(2.66rem, calc(0.3rem + 7.9vw), 3.85rem);
  --step-4: clamp(3.55rem, calc(0.39rem + 10.53vw), 5.13rem);
  --step-5: clamp(4.74rem, calc(0.53rem + 14.03vw), 6.84rem);
}

* {
  box-sizing: border-box;
}

:root {
  --color-primary: #00032e;
  --color-secondary: #f5f5f5;

  --color-block-1: rgba(255, 255, 255, 1);
  --color-block-2: rgba(200, 255, 255, 0.75);
  --color-block-3: rgba(255, 255, 255, 0.5);
  --color-block-4: rgba(255, 255, 255, 0.25);

  --font-body: "Erode", sans-serif;
  --font-headings: "Satoshi", sans-serif;
}

table {
  border-collapse: collapse;
}

body {
  color: var(--color-primary);
  font-family: var(--font-body);
  font-size: 22px;
  line-height: 1.5;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  padding: 2rem;
  background-color: var(--color-secondary);
  font-variant-numeric: tabular-nums;
}

figure {
  width: 100%;
  max-width: 800px;
}

.table-full {
  text-align: left;
  border-collapse: collapse;
  table-layout: fixed;
  margin-bottom: 1rem;
  border-radius: 3rem;
  width: 100%;
}

th,
h1,
h2,
strong {
  font-family: var(--font-headings);
}

th,
strong {
  text-transform: uppercase;
}

.table-full tbody td,
.table-full tbody th {
  vertical-align: top;
  padding: var(--step--2);
}

.table-full th {
  font-family: var(--font-headings);
  font-weight: bold;
}

.table-full tr > * {
  padding: 0.75rem 1rem;
}

.table-full td span {
  width: 100%;
  display: inline-block;
  border-radius: 0.3rem;
  height: calc(var(--step-4) * 2);
  padding: var(--step--2);
  font-size: var(--step--1);
}

.table-full tbody tr > * + * {
  border-left: 1px solid #aaa;
}

.table-full tbody {
  background-color: #dedede;
}

.table-full thead {
  background-color: #e8e8e8;
}

.block-1 {
  background-color: #3a005e;
  color: var(--color-secondary);
}

.block-2 {
  background-color: #527662;
  color: var(--color-secondary);
}

.block-3 {
  background-color: #2110a3;
  color: var(--color-secondary);
}

.block-4 {
  background-color: #c81a59;
  color: var(--color-secondary);
}

.block-empty {
  background-color: #ababab;
}

.table-full thead {
  font-size: var(--step-0);
}

caption {
  text-align: left;
  margin-bottom: 1rem;
}

h1 {
  margin-top: 0;
  margin-bottom: var(--step--2);
  font-family: var(--font-headings);
  font-size: var(--step-1);
  display: block;
}

figure {
  display: block;
}

.table-wrapper {
  max-width: 1280px;
}

.table-map {
  width: 100%;
}

.table-map th,
.table-map th {
  font-size: var(--step--1);
}

.table-map tbody th {
  padding: 0 var(--step--1);
}

.table-map thead th {
    padding: var(--step--1) calc(var(--step--2) / 2);
}

.table-map td {
  padding: calc(var(--step--1) / 2);
}

.table-map tbody td {
  text-align: center;
}

.table-map span {
  display: inline-block;
  width: var(--step-1);
  height: var(--step-1);
  border-radius: calc(var(--step-1) / 8);
}

ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.list > li {
  display: flex;
  gap: var(--step-2);
  align-items: baseline;
}

.list ol li {
  display: flex;
  padding-bottom: var(--step--2);
  gap: var(--step-0);
  align-items: baseline;
  justify-content: space-between;
}

.list ol li div:first-child {
  font-family: var(--font-headings);
  font-size: var(--step--2);
}

.list > li {
  border-bottom: 1px solid #aaa;
  padding: var(--step--1) var(--step-0);
}

.list > li:first-child,
.table-map tr > td:nth-child(2),
.table-map tr > th:nth-child(2) {
  background-color: rgba(0,0,0,0.06);
}

.table-map tr > th:nth-child(2) {
  box-shadow: inset 0 4px 0 0 darkgreen;
}

.list > li:first-child {
  box-shadow: inset 4px 0 0 0 darkgreen;
}

.list {
  margin-bottom: var(--step-3);
}

.list > li > div:last-child,
.list ol > li > div:last-child {
  flex-grow: 1;
}

@media screen and (min-width: 960px) {
  .table-map, .list {
    display: none;
  }
  
  .table-full thead th:nth-child(2) {
    box-shadow: 0 -4px 0 0 darkgreen;
  }
  
  .table-full tbody tr:last-child > td:nth-child(2) {
    border-bottom: 2px solid #aaa;
  }
  
  .table-full thead th:nth-child(2),
  .table-full tbody tr > td:nth-child(2) {
    border-left: 2px solid #aaa;
    border-right: 2px solid #aaa;
    background-color: #ccc;
  }
}

@media screen and (max-width: 959px) {
  .table-full {
    display: none;
  }
  
  .list span {
    display: inline-block;
    padding: calc(var(--step--2) / 4) var(--step--1);
  }
}
!

JS 

              
                // Thanks to Adrian Roselli for this really useful snippet https://adrianroselli.com/2017/11/a-responsive-accessible-table.html
// https://adrianroselli.com/2018/02/tables-css-display-properties-and-aria.html
// https://adrianroselli.com/2018/05/functions-to-add-aria-to-tables-and-lists.html
function AddTableARIA() {
  try {
    var allTables = document.querySelectorAll("table");
    for (var i = 0; i < allTables.length; i++) {
      allTables[i].setAttribute("role", "table");
    }
    var allRowGroups = document.querySelectorAll("thead, tbody, tfoot");
    for (var i = 0; i < allRowGroups.length; i++) {
      allRowGroups[i].setAttribute("role", "rowgroup");
    }
    var allRows = document.querySelectorAll("tr");
    for (var i = 0; i < allRows.length; i++) {
      allRows[i].setAttribute("role", "row");
    }
    var allCells = document.querySelectorAll("td");
    for (var i = 0; i < allCells.length; i++) {
      allCells[i].setAttribute("role", "cell");
    }
    var allHeaders = document.querySelectorAll("th");
    for (var i = 0; i < allHeaders.length; i++) {
      allHeaders[i].setAttribute("role", "columnheader");
    }
    // this accounts for scoped row headers
    var allRowHeaders = document.querySelectorAll("th[scope=row]");
    for (var i = 0; i < allRowHeaders.length; i++) {
      allRowHeaders[i].setAttribute("role", "rowheader");
    }
    // caption role not needed as it is not a real role and
    // browsers do not dump their own role with display block
  } catch (e) {
    console.log("AddTableARIA(): " + e);
  }
}

AddTableARIA();
!
999px

Console