* {
    font-family: CMS, Arial, Calibri, Ubuntu, Roboto, Liberation Sans, Helvetica, sans-serif;
}

body {
    background-image: url("../image/oobe.jpg");
    background-size: 100%;
    background-repeat: no-repeat;
    background-position: initial;
}

.discover {
    max-width: 40%;
}

a img {
    vertical-align: middle;
    padding-right: 5px;
}

a {
    padding: 10px;
    border-radius: 5px;
    border-style: solid;
    border-color: black;
    border-width: 1px;
    text-decoration: none;
    color: black;
    transition: border-color 200ms, color 200ms;
}

a:hover {
    border-color: rgb(43, 43, 43);
    color: rgb(43, 43, 43);
}

a:active {
    border-color: rgb(77, 77, 77);
    color: rgb(77, 77, 77);
}

hr {
    width: 64px;
    border-color: black;
    border-style: solid;
    border-width: 1px;
    border-bottom: none;
}

a:hover > img {
    filter: opacity(75%);
}