header, footer, section, article, aside {
  margin: 10px;
  background: silver;
  border-radius: 6px;
  color: black;
  font: 14px/24px "monospace";
  padding: 24px 15px;
  box-shadow: -1px 2px 5px 1px rgba(0, 0, 0, 0.7);
  display: block;
}

#escudo {
  float: center;
  width: 100%
}

header, footer {
  text-align:left;
  clear: both;
}

section {
  float: left;
  width: 71%;
}

aside {
  float: right;
  width: 19%;
}

/* Para menu de navegación */
body {
  background-color: #EBE8E4;
  color: #222;
  font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif;
  font-weight: 300;
  font-size: 15px;
}

nav {
  background-color: #fff;
  border: 1px solid #dedede;
  border-radius: 4px;
  box-shadow: 0 2px 2px -1px rgba(0, 0, 0, 0.055);
  color: #888;
  display: block;
  margin: 8px 22px 8px 22px;
  overflow: hidden;
  width: 96%; 
}

  nav ul {
    margin: 0;
    padding: 0;
  }

    nav ul li {
      display: inline-block;
      list-style-type: none;
      
      -webkit-transition: all 0.2s;
        -moz-transition: all 0.2s;
        -ms-transition: all 0.2s;
        -o-transition: all 0.2s;
        transition: all 0.2s; 
    }
      
      nav > ul > li > a > .caret {
        border-top: 4px solid #aaa;
        border-right: 4px solid transparent;
        border-left: 4px solid transparent;
        content: "";
        display: inline-block;
        height: 0;
        width: 0;
        vertical-align: middle;
  
        -webkit-transition: color 0.1s linear;
     	  -moz-transition: color 0.1s linear;
       	-o-transition: color 0.1s linear;
          transition: color 0.1s linear; 
      }

      nav > ul > li > a {
        color: #aaa;
        display: block;
        line-height: 56px;
        padding: 0 24px;
        text-decoration: none;
      }

        nav > ul > li:hover {
          background-color: rgb( 40, 44, 47 );
        }

        nav > ul > li:hover > a {
          color: rgb( 255, 255, 255 );
        }

        nav > ul > li:hover > a > .caret {
          border-top-color: rgb( 255, 255, 255 );
        }
      
      nav > ul > li > div {
        background-color: rgb( 40, 44, 47 );
        border-top: 0;
        border-radius: 0 0 4px 4px;
        box-shadow: 0 2px 2px -1px rgba(0, 0, 0, 0.055);
        display: none;
        margin: 0;
        opacity: 0;
        position: absolute;
        width: 165px;
        visibility: hidden;
  
        -webkit-transiton: opacity 0.2s;
        -moz-transition: opacity 0.2s;
        -ms-transition: opacity 0.2s;
        -o-transition: opacity 0.2s;
        -transition: opacity 0.2s;
      }

        nav > ul > li:hover > div {
          display: block;
          opacity: 1;
          visibility: visible;
        }

          nav > ul > li > div ul > li {
            display: block;
          }

            nav > ul > li > div ul > li > a {
              color: #fff;
              display: block;
              padding: 12px 24px;
              text-decoration: none;
            }

              nav > ul > li > div ul > li:hover > a {
                background-color: rgba( 255, 255, 255, 0.1);
              }