#menu_strony a:link,#menu_strony a:visited
    {
        text-decoration: none;
        color: black;
        border: 1px solid cornflowerblue;
        background-color: white;
        padding: 10px;
        display: inline-block;
    }
    #menu_strony a:hover,#menu_strony a:active
    {
        color: white;
        background-color: cornflowerblue;
    }