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

body {
    background-color: rgb(240, 240, 240);
    font-family: Arial, Helvetica, sans-serif;
    color: black;
    display: block;
    text-align: center;
    
}



#head {
    text-align: center;
    padding: 40px;
    font-size: 30px;
    background-color: #006633;
    color: white;
}

#nav {
    width: 25%;
    background-color: rgb(240, 240, 240);
    min-height: 300px;
    font-size: 40px;
   
}

a {
    text-decoration: none;
    width: 100%;
}

a:hover {
    text-decoration: none;
    background-color: rgb(235, 234, 234);
    color: rgb(153, 150, 150);
}

#nav li:hover {
    background-color: rgb(235, 234, 234);
    color: rgb(153, 150, 150);
}




#footer {
    background-color: #006633;
    color: white;
    padding: 15px;
    text-align: center;
    font-size: 30px;
}

#nav a                             { text-decoration: none;
    display: inline-block; 
    width: 100%;; }
#nav ul                            { padding: 0px;
    margin: auto;
    border-radius: 30px; }
#nav li                            { padding: 0px;
    list-style-type: none;
    margin: 10px;
    background-color: white;
    border: 5px solid white;
    border-radius: 20px;  }

#article {
    padding: 20px;
    width: 75%;
    font-size: 30px;
    min-height: 340px;
    background-color: white;
    

}





.p1 {

    text-align: justify;
}



#nav,
#article {
    float: left;
}

.section::after {
    content: "";
    display: table;
    clear: both;
}

@media screen and (max-width:600px)   {  nav        { width: 100% };  
                                    article   { width: 100% };
                                footer { width: 100% };  }