No table CSS

I tried to create a Views table and found that there was no CSS for the table design.

As a basis, I copied the following from another theme into the page.css file, but this should really be tweaked and added to the correct CSS file.

table {
  margin: 0 0 1.5em;
  width: 100%;
  border:1px solid #ddd;
  border-right:none;
  background:#fff;
}

th {
  font-weight: bold;
  padding:10px 10px;
  background:#555;
  color:#fff;
}

tr{
  padding:5px 5px;
}

td{
  padding:5px 10px;
  border-top:1px solid #ddd;
  border-right:1px solid #ddd;
}