a {
        text-decoration: none; 
     color:whitesmoke;
}

a:hover {color:aqua}

body {
    margin:10px;
    padding: 0px;
    font-family: sans-serif;
    background-color: #ffc0c0;
    border: solid 5px white;

}

main { margin: auto;
     background-color: ghostwhite;
    text-align: center;
    font-weight: bold;
}

ul{
    list-style:none;
    border: solid 2px orange;
}

header,
footer {
    background-color: #f5ad55;
    padding: 1em;
    color:whitesmoke
}


#navprincipal {
display: flex;
    flex-wrap: nowrap;
    justify-content: space-evenly;
    background-color: none;
    text-align: center;
    font-family: sans-serif;
    padding: .5em;
    margin: 1em;
    list-style: none;

        
}
.presentacion {
    font-family: monospace;
font-size: 2.5em;
padding: 0.2em }
        
#materiasdeprimero{
font-family: monospace;
    font-size: 1.5em;
    background-color: #7ccdd0;
    
}

#materiassegundo{
    background-color:#7ccdd0;
    font-family: monospace;
    font-size: 1.5em;

}

#materiastercero {
font-family: monospace;
    font-size: 1.5em;
    background-color: #7ccdd0;
}

header .contenedormenu {

    margin: 1em;
    background-color: darkcyan;
}
   

monospace