1.Log in to your dashboard--> layout- -> Edit HTML

2.Click on "Expand Widget Templates"

3.Scroll down to where you see this:
         a:hover {
                       text-decoration:underline;
                      }

4.Now Replace the above code with the code given below:
           a:hover {
                         position: relative;
                         bottom: 5px;
                         left: 1px;
                         color:#000000;
                         }

5.Click on "Save Templates" and refresh your site.

Note : You can change the color of your link to your desired color when it tweaks.