ul{
   list-style-type: none;
   margin: 0;
   padding: 0;
   display: flex;
   flex-direction: row;
   flex-direction: column;
}

li{
   flex-grow: 1;
}

a{
   display: block;
   padding: 1em;
   background-color: LightGray;
   text-align: center;
   margin-right: 0.2em;
   margin-bottom: 0.2em;
   text-decoration: none;
   color: #000000;
}

a:hover{
   background-color: LightCoral;
}