.linktree 
{
    list-style-type: none;
    text-align: center; 
    display: block;
    font-size: 32px;
    padding: 5px;
}

.linktree a:link 
{
    display: block;
    color: black;
    font-size: 32px;
    border-style: solid;
    border-width: 1px;
    border-color: darkred;
    background-color: slategrey; 
    padding: 5px;
    margin: 5px;
}
.linktree a:visited {
    display: block;
    color: black;
    background-color: gray; 
}
.linktree a:hover {
    color: black;
    display: block;
    border-width: 2px;
    border-color: slategray;
    background-color: darkorange; 
}