html, body {
    height: 100%;
}

body {
    display: flex;
    align-content: space-around;
    align-items: center;
    justify-content: center;
    background: black;
    background: url(brain.png);
    background-size: cover;
    background-position: bottom right;
    color: white;
}

div {
    text-align: center;
}

.heading {
    font-size: 5em;
    margin: 0.5em;
}

.subheading {
    font-size: 2em;
    margin: 0.5em;
}
.contact {
    font-size: 2em;
    margin: 0em;
}

a {
    color: white;
    text-decoration: none;
}
a:hover {
    color: lightgreen;
    text-decoration: underline;
}