.link-tetsuko a {
   display: block;
   background: #ffffff;
   padding: 10px;
   margin: 3px;
   text-align: center ;
   border: 1px solid #a5a5a5;
   float: left ;
   width:180px;
}

.link-tetsuko a:hover {
   display: block;
   background: #e9f4ff;
   padding: 10px;
   margin: 3px;
   text-align: center ;
   border: 1px solid #164abe;
   float: left ;
   width:180px;
}