html, body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: cadetblue;
    background-image: url(./imagens/dns-background02.jpg);
    background-position: top;
    background-repeat: no-repeat;
    background-size: 600px;
  }
  p {
    color:black;
    font-family: 'Times New Roman'; 
    text-align: center;
    font-size: 1.8em;
    border-style: double;
    }
  h1 {
    color:brown; 
    font-family: Verdana; 
    text-align: center;
    border-bottom-style: solid;
    }
  

/* define a fixed width for the entire menu */
.navigation {
  width: 250px;
}

/* reset our lists to remove bullet points and padding */
.mainmenu, .submenu {
  list-style: none;
  padding: 0;
  margin: 0;
}

/* make ALL links (main and submenu) have padding and background 
color */
.mainmenu a {
  display: block;
  background-color: #CCC;
  text-decoration: none;
  padding: 10px;
  color: #000;
}

/* add hover behaviour */
.mainmenu a:hover {
    background-color: #C5C5C5;
}


/* when hovering over a .mainmenu item,
  display the submenu inside it.
  we're changing the submenu's max-height from 0 to 200px;
*/

.mainmenu li:hover .submenu {
  display: block;
  max-height: 270px;
}

/*
  we now overwrite the background-color for .submenu links only.
  CSS reads down the page, so code at the bottom will overwrite
  the code at the top.
*/

.submenu a {
  background-color: #999;
}

/* hover behaviour for links inside .submenu */
.submenu a:hover {
  background-color: #666;
}

/* this is the initial state of all submenus.
  we set it to max-height: 0, and hide the overflowed content.
*/
.submenu {
  overflow: hidden;
  max-height: 0;
  -webkit-transition: all 0.4s ease-out;
}