.main-body {
    height: 100%;
    width: 100%;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    background: no-repeat center;
    background-size: cover;
}

.main-body h1, .main-body h3 {
    text-shadow:
            -1px -1px 0 #131313,
            1px -1px 0 #131313,
            -1px 1px 0 #131313,
            1px 1px 0 #131313;
}

.main-body h1 {
    font-size: calc(1.4rem + 1.5vw);
}

.main-body h3 {
    font-size: calc(0.9rem + 0.5vw);
}