I am working on the HTML and CSS and I get this result which is not perfect:
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1 . To remove the double-border look of a table
Just edit your table tag as following:
...
To give color to the borders add : bordercolor="#00F"
But cellpadding, cellspacing,border etc of a table are Deprecated Attributes.Instead you can use the CSS styles equivalent to the above from the following table:

2 . To remove the double-border look of a table and to obtain the exact output as the image shown in the question
Best solution : Use border-collapse:collapse; for the element.