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dabblet.css

.col1{
background-color: blue;
}
.col2{
background-color: red;
}
.col3{
background-color: green;
}

dabblet.html

<table>
<colgroup>
    <col class="col1" />
    <col class="col2" />
    <col class="col3" />
</colgroup>
<tr>
<td>a</td>

<td>b</td>

<td>c</td>
</tr>


<tr>
<td>a</td>

<td>b</td>

<td>c</td>
</tr>

settings.json

{"view":"separate","fontsize":"110","seethrough":"","prefixfree":"","page":"all"}