doubleBorder function
Creates a double line border style.
Implementation
UvBorder doubleBorder() => const UvBorder(
top: Side(content: '═'),
bottom: Side(content: '═'),
left: Side(content: '║'),
right: Side(content: '║'),
topLeft: Side(content: '╔'),
topRight: Side(content: '╗'),
bottomLeft: Side(content: '╚'),
bottomRight: Side(content: '╝'),
);