html {
    font-family: Arial, Helvetica, sans-serif;

}

.content-container {
    position: absolute;
    left: 50%;
    top: 50%;
    height: 200px;
    margin-top: -100px; /* half of you height */
    width: 400px;
    margin-left: -200px; /* half of you width */
    text-align: center;
}

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