body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 3%;
    background-color: whitesmoke;
}

.annot {
    display: inline-block;
}
  
.annot a {
    color: black;
    float: left;
    padding: 5px 12px;
    text-decoration: none;
    transition: background-color .3s;
    border: 1px solid #ddd;
}
  
.annot a.active {
    background-color: #525252;
    color: white;
    border: 1px solid #525252;
}

.annot a:hover:not(.active) {background-color: #cccccc;}