A calendar for March has been created in index.html.
Every 7th day is Sunday.
It should be marked with a red background in the calendar.
Use the correct pseudo-class for the class .day

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<!DOCTYPE html>
      h2 {
        font-family: monospace;
        margin-bottom: 10px;
      .day {
        color: white;
        padding: 5px 10px;
        font-family: monospace;
        font-size: 16px;
        border-radius: 4px;
        background-color: rgb(255, 198, 0);
      <span class="day">1</span>
      <span class="day">2</span>
      <span class="day">3</span>
      <span class="day">4</span>
      <span class="day">5</span>
      <span class="day">6</span>
      <span class="day">7</span>
      <span class="day">8</span>
      <span class="day">9</span>
      <span class="day">10</span>
      <span class="day">11</span>
      <span class="day">12</span>
      <span class="day">13</span>
      <span class="day">14</span>
      <span class="day">15</span>
      <span class="day">16</span>
      <span class="day">17</span>
      <span class="day">18</span>
      <span class="day">19</span>
      <span class="day">20</span>
      <span class="day">21</span>
      <span class="day">22</span>
      <span class="day">23</span>
      <span class="day">24</span>
      <span class="day">25</span>
      <span class="day">26</span>
      <span class="day">27</span>
      <span class="day">28</span>
      <span class="day">29</span>
      <span class="day">30</span>
      <span class="day">31</span>