body {
    background:url(imagenes/fotofondo.jpg);
    font-family: "calibri";
    font-size: 12px;
    line-height: 2.0;
    margin: 0 auto;
    max-width: 800px;
    padding: 4em 2em 4em;
}
.menu-main{
    background: #F3F7C5;
    height: 45px;
    border-bottom: 1px solid#29487d;
    display: flex;
    justify-content: space-between;
}
.menu-main a{
    font-family: verdana;
    color: darkblue;
    text-decoration: none;
    font-size: 9px;
    font-weight: bold;
    flex:1;
    display: flex;
    justify-content: center;
    align-items: center;
}
.menu-main a:hover{
    background: rgba(0,0,0,.1);
}
.menu-main a.active{
    background: #17a2b8;
    
}

contenedor {
  width: auto;
  margin: auto;
  display: flex;
  flex-direction: column;
}

h1 {
    color:darkblue;
    font-family:sans-serif;
    text-align: center;
    
}

h2 {
    color:darkblue;
        font-family:sans-serif;
    text-align: center;
}

h3 {
    color:darkblue;
    font-family:sans-serif;
    font-family: "timesnewroman";
    font-size: 10px;
    
}
    
p {
    color:black;
        font-family:"arial";
        font-size: 11px;
}
nav {
   width: auto;
  margin: auto;
    color: aqua;
    transition: all.4s;
 }