* {
    margin: 0;
    padding: 0;
    font-family: Roboto, arial;
    box-sizing: border-box;
}

body {
    background-color: whitesmoke;
}

#wrapper {
    max-width: auto;
    max-height: auto;
    margin: 0 auto;
    background-color: whitesmoke;

}

header img {
    width: 100%;
    display: block;
}


nav {
    overflow: hidden;
}

a.menu {
    display: block;
    width: 25%;
    float: left;
    color: black;
    text-align: center;
    text-decoration: none;
    background-color: yellow;
    padding: 15px 2px;
    font-size: 15px;
    -webkit-transition: all 1s ease;
    transition: all 1 ease;
}

a.menu:hover {
    font-size: 15px;
    background-color: crimson;
}

@media (max-width:900px) {
    nav a {
        width: 50%;
    }
}

article {
    margin-top: 30px;
    margin-bottom: 30px;
    padding: 0 20px;
}

article h1 {
    font-size: 30px;
    text-align: center;
    margin: 20px 10% 20px 10%;
    padding-bottom: 15px;
    border-bottom: 4px solid crimson;
}

article p {
    text-align: center;
    line-height: 25px;
    font-size: 18px;
    padding: 0px 0 0px 0;

}

/*
        footer {
            //background-color: #333;
            color: #fff;
            //text-align: center;
            padding: 10px 20px;
            position: fixed;
            bottom: 0;
            width: 100%;
        }*/


footer {
    font-size: 15px;
    text-align: center;
    background-color: yellow;
    padding: 10px;
    position: fixed;
    bottom: 0;
    width: 100%;

}

< ! REFERENCJE #stopka {
    background-color: aqua;
}

#zdjecie {
    width: 100%;
    display: block;

}