.center {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

a:link {
    color: rgb(143, 206, 254);
    background-color: transparent;
    text-decoration: underline;
}

a:visited {
    color: pink;
    background-color: transparent;
    text-decoration: none;
}

a:hover {
    color: rgb(184, 209, 229);
    background-color: transparent;
    text-decoration: underline;
}

a:active {
    color: yellow;
    background-color: transparent;
    text-decoration: underline;
}