body {
    background: white;
    margin: 0;
}

.header {
    background-image: url('../img/bg.jpg');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2em;
}

.container-fluid {
    width: 100%;
    padding: 0;
}

.title,
.subtitle {
    background-color: #fff;
    width: 100%;
    padding: 1em;
}

.title h1 {
    font-size: 4em;
}

.subtitle h3 {
    font-size: 2em;
}

@media (min-width: 768px) {
    .header {
        height: 100vh;
    }

    .title {
        margin-top: 6em;
    }

    .title h1 {
        font-size: 10em;
    }

    .subtitle h3 {
        font-size: 3em;
    }
}