new line in index.html in game section:
    <script src='panel.js'></script>
new for styles.css
#panel {
  grid-row: 2 / span 1;
  grid-column: 2 / span 5;
  display:flex;
  justify-content: space-evenly;
  align-items: center;
  opacity:.6;
}
.cell {
  width:5vmin;
  height:5vmin;
  border:3px groove;
}
making the panel work

First remove the onClick attribute from the rock in your index.html.
Then add this cell_clicked function to your clicks.js:

function cell_clicked(image) {
  if (image.id==g_colours[g_kount]) {
    Hide(image.id);
    g_kount++;
    if (g_kount==7) open_rock();
  } else {
    Show_class('cell'); g_kount=0;
  }
}

Still more to do ... see the next page.