body {
    background:black;
    font-family: 'Xanh Mono', monospace;
    color: #8e998f;
}

img {
    max-width: 50%;
    height: auto;
    margin-top: 40px;
    margin-bottom: 640px;
    margin-left: auto;
    margin-right: auto;
    display: block;
}

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

a:hover {
    background-color: #797979;
  }