* {
    margin: 0;
    padding: 0;
    /*    box-sizing:border-box;*/
}

html {
    font-size: 10px;
    font-family: 'Oswald', sans-serif;
    background-color: black;
}



/* nawigacja */
nav a {
    display: inline-block;
    font-size: 1.8rem;
    font-family: "roboto Condensed"sans-serif;
    text-transform: uppercase;
    text-decoration: none;
    color: #555;
    padding: 10px;
}

/* header */

header {
    height: 90vh;
    width: 100vw;
    background-image: url('martavini.jpg');
    background-position: center;
    background-size: cover;
}