#informations {
    /* width: 75%; */
    width: 400px;
    background-color: #f3f3f3;
    font-family: sans-serif;
    margin: auto;
}
#informations a {
    text-decoration: none;
    background-color: #333;
    border-bottom: 2px solid #f3f3f3;
    display: block;
    padding: 10px;
    color: #f3f3f3;
    transition: 0.5s;
}
#informations a:hover {
    color: orangered;
}
#informations div {
    display: none;
}
#informations section:target div {
    display: block;
    padding: 15px;
}