body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-image: url('./error_404.svg');
    background-color: rgb(0, 0, 0);
    color: white;
    text-align: center;
    _background-size: 20%;
}

.center-logo {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 748px;
    height: 272px;
    background-image: url('./error_404.gif');
    margin-top: calc(50vh - 136px);
}

a {
    color: cyan;
    text-decoration: none;
}

/* visited link */
a:visited {
    color: cyan;
}