thickBorder function
Creates a thick line border style.
Implementation
UvBorder thickBorder() => 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: '┛'),
);