body {
    background-image: linear-gradient(180deg, #0f1d3f, hsla(0, 0%, 100%, 0)), url(../img/bg.jpg);
    background-position: 0 0, 50% 50%;
    background-size: auto, cover;
    background-repeat: repeat, no-repeat;
    background-attachment: scroll, fixed;
    color: #fff;
}

.main {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.intro {
    text-align: center;
}

.intro a {
    color: #ffffff;
}