Hi there,
Welcome to the SeaTheme forum.
1. Please update the above CSS snippets as:
.entry p a, .comment p a, .text_block li a,
.entry p a:hover, .comment p a:hover, .text_block li a:hover {
text-decoration: underline;
}
2. Please use text-underline-offset, it is for the distance
.entry p a, .comment p a, .text_block li a,
.entry p a:hover, .comment p a:hover, .text_block li a:hover {
text-underline-offset: 4px;
}
Regards!
SeaTheme – FAQs – WordPress Customization – Facebook