.tema{
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    font-weight: bold;
    font-size:large;
    margin-top: 30px;

}

.subtema{
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    font-weight: bold;
    font-size:medium;
    margin-top: 15px;
    margin-bottom: 8px;
}

ul{
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    font-size: 16px;
}

ol li a{
    text-decoration: none;
    color: black;
}

a{
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    font-size: 16px;
    color: blue;
    text-decoration: none;
}
a:hover {
    background-color:rgb(236, 234, 234);
    color: darkblue
}
a:active {
    color:#3d0225;
}

.submenu {
      top: 20px; 
      clear:both;
      position: fixed;
      height: auto;
      text-align: left;
      margin: 0 auto;
}   
.contenido{
    overflow-y: scroll; 
    height: 350px; 
    margin-top: 50px;
    padding-right: 20px;
    position: fixed;
}

.contenedor{
    display: flex;
    justify-content: center;
}