body {
    height: 100vh;
    background: linear-gradient(135deg, #1c2a3a, #4d697d);
}

div.index.container {
    height: auto;
    text-align: center;
    margin-top: 70px;
}
.index img{
    box-shadow: 0 0 60px rgba(0, 0, 0, 0.5);
    height: 35em;
}