ul{
text-align:right;
padding:30px;
}

li{
font-weight:900;
display:inline;
padding:10px;
text-transform:uppercase;
}

a{
  text-decoration:none;
  color:white;
  padding:8px;
  border-bottom: 2px solid transparent;
  transition-duration:0.2s;
}

a:hover{
  border-bottom: 2px solid red;
}