Using CSS for solid color background across/between table cells

Consider the following code:

HTML:

<table>
    <tr>
        <td>Hello</td>
        <td>Stack</td>
        <td>Overflow</td>
    </tr>
    <tr>
        <td>some</td>
        <td>text</td>
        <td>here</td>
    </tr>
</table>
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CSS:

table {
    border-spacing: 40px 10px;
    border-collapse: separate;
}
tr:first-child {
    background-color: #aaa;
}
td {
    padding: 5px;
}

I would like the background color on the first row to be between the cells also.

How could I do this ?

I'm sorry but according to this (the last paragraph of section 17.5.1), the background between the cells when you use "border-collapse: separate" is the background of the table element.

This is not possible when using border-spacing, but you could try using individual cell padding instead...

table {
  border-collapse: separate;
}
tr:first-child td {
  background-color: #aaa;
}
td {
  padding: 10px 40px;
}

Live demo available here