*{
    margin: 0;
    padding: 0;
    border; 0; 
    box-sizing: border-box;
    font-family: "Gotham", sans-serif;
}


body {
    background-color: white;
    background:url(../imagenes/forest.jpg);
    background-repeat: no-repeat;
          }

body nav ul li {
    color:black;
    background-color: #373737;
    text-decoration: none;
    text-align: center;
    display:block;
    margin: 0,2em;
    margin-top: 5px;
    margin-bottom: 5px;
    padding:10px;
    border-radius: 5px;
}


body nav ul li a {
    color: white;
    font-weight: 500;
    font-size:17px;
    list-style: none;
    text-decoration: none;
    margin: 3em;
   }

body nav ul li a:hover {
    font-weight: 600;
    color: #fbc02d;
}   

body h1 {
    color: #373737;
    text-align: center;
    font-weight: 700;
}


body p  {
    color: #373737;
    margin: 2em;
    text-align: center;
    font-size: 15px;
    font-weight: 600;
}


body  {
    color: #373737;
    list-style: none;
    text-decoration: none;
    margin: 2em;    
    }
        


#principal   {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    border; 0; 
}

img.sofia{
    image-orientation: center;
    width: 290px;
    height: 290px;
    display:block;
    margin: auto;
    margin-top: 2em;
}





.materias {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    margin: auto;
    margin-top: 30px;
   
}


.materiasap {
    min-width: 150px;
}


h3 {
    font-size: 17px;
    padding-bottom: 5px;
}

body ul li {
    font-size: 15px;
    padding-top: 5px;
    text-decoration: none;
    list-style: none;
  }




footer{
    margin-top: 2rem;
    background-color: #373737;
    color:white;
    text-align: center;
    font-size: 10px;
    border-radius: 5px;
    height: 15em;
    padding-left:  10px;
    padding-right: 10px;
}


.uba {
     width: 40px;
     margin-top: 1em;
     }


.fadu {
      width: 60px;
      margin-top: 1em;
      }

footer h2 {
  font-size: 10px;
  margin-top: 5px;
  font-weight: 100;

  }