body{ background: linear-gradient(356deg, rgba(13,13,13,1) 0%, rgba(24,24,24,1) 37%, rgba(4,40,121,1) 75%, rgba(4,54,168,1) 100%);
color: aliceblue;
}

header{
    text-align: center;
    color: rgb(255, 166, 2);
    font-weight: bold;
    margin-top: 50px;
    
}

.contenido {
    width: 100%;
    margin: auto;
    
  }

  section{
    float: left;
    width: 80%;
    height: 90%;
    
    text-align: center;
    font-size: medium;
}

aside{
    float: left;
    width: 20%;
    height: 90%;
    margin-top: 40px;
}

nav{
    text-align: left;
    margin-top: 60px;
}

.tarjeta{
    margin: 50px 30px ;
    padding: 50px;
    border: 20px;
    text-align: left;
    width: auto;
    height: auto;
color: rgb(0, 0, 0);
background-color: rgb(255, 255, 255);
}