This is not a good link: link

This is better: link

Ideal style would be, in my opinion:

.thread_body a {
    color:white !important;
    border-bottom: 1px solid #666; 
    text-decoration: none;
}
.thread_body a:hover {
    border-bottom-color: white;
    text-decoration: none;
}

But anything is good just to make links visible in text.