header, section, footer, aside, nav, article{display: block;}
body{text-align:center;}


#envoltura{
	                  background-color: rgba(5, 100, 210, 0.8); 
	                  width: 960px;
	                  margin: 15px auto;
	                  text-align: left;
	                  padding: 50px 30px 20px 80px;} 

#menu {   
       background-color: rgba(0, 10,145, 0.99);
       width: 880pxs
       padding: 25px;
       margin: 10px auto;}

#menu li {display: inline-block;padding: 10px 25px 10px 25px;
  } 

  .boton_2:hover { 
    background-color: yellow;
    color: black ;
    transition: background 1s, color 1s;}
#menuu{ 
 background-color: rgba( 00, 145, 155, 0.99);
 width: 1560px;
 float: center ;
  text-align: left;
  width:1000;
  } 
  #envoltura h1{text-align: right;} 
	#menu{
		background-color: rgba(201, 7, 7, 0.99);
      }
.boton_2{
    text-decoration: none;
    padding: 10px;
    font-family: arial;
    text-transform: uppercase;
    padding-left: 15px;
    padding-right: 15px;
    font-weight: 80;
    font-size: 25px;
    color: black;
    background-color: rgba(0,140,140,1);
  }
 
  
  #pie {clear: both;
      background-color: rgba(42,78,223,0.99);
      text-align: center;
      padding: 5px;
      margin: 5px;
      margin-top: 10px;}
#seccion { float: left;
width: 90%;
margin: 5px;
border-radius: 20px;
padding: 10px;
background-color: rgba(201,7,7,0.8);}