body {background-color: white;overflow-x: hidden;}
        a:link {text-decoration: none;color: black;}
        a:visited {text-decoration: none;color: black;}
        a:hover {text-decoration: none;background-color: #e6ecff; color: red;}
        a:active {text-decoration: none;}
        h1 {color: black;font-size:40px;position:relative;}
                h2 {color: black;font-size:35px;position:relative;}
                        h3 {color: black;font-size:30px;position:relative;}
                            h4 {color: black;font-size:20px;position:relative;}
        p{color: black; font-size:20px; position:relative; max-width: vw; text-align: justify}
        pre{color: black;position:relative;max-width: vw;}
        header{border-style: inset; border-color: #667FCC; color: white; font-size:3vw; background-color: #809fff; position: relative ; max-width: vw;}
        footer{border-style: outset; border-color: #667FCC; color: black; font-size:20px; background-color: #809fff; position:relative; max-width: vw;}
        nav{position:relative; color: black; font-size:20px;} 
        img{position:relative; max-width:vw; }