Here's a simple CSS stylesheet that you can use to style the HTML table:

table {
  width: 80%;
  margin: auto;
  border-collapse: collapse;
}

th, td {
  border: 1px solid black;
  padding: 8px;
  text-align: left;
}

th {
  background-color: lightgray;
}

This stylesheet will give the table a width of 80% of the container, center it horizontally, and have a border around each cell. The header cells have a light gray background color. You can adjust the styles to meet your specific needs.
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