Improving table responsiveness

Hello, I want to improve my table responsiveness. I used code from an online tutorial for the mobile version and the result is not perfect: there is a double border and I don't know how can I improve that. I also look for a guide to learn proper CSS from the start.

This is the related code:


/* Force table to not be like tables anymore */
table, thead, tbody, th, td, tr {
display: block;
}

/* Hide table headers */
thead tr {
position: absolute;
}

tr {
border:1px solid #030;
}

td {...
Code (markup):
Improving table responsiveness

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