*{
    font-family: Garamond, serif;
}
header, footer{
    background-color: navy;
    color: white;
    text-align: center;
    padding: 5px;
    letter-spacing: 3px;
}
nav,aside, section{
    float: left;
    height: 500px;
    }
nav, aside{
    background-color: dodgerblue;
    width: 35%;
}
section{
    background-color: skyblue;
    width: 30%;
    float:left;
    text-align: center;
}
input[type="number"],
input[type="button"]{
    margin: 10px;
}
h3{
    text-align: center;
}
h3::first-letter{
    font-size: 200%;
}
p{
    font-size: 150%;
}
.figura{
     box-shadow: 5px 5px 10px dimgray;
     border-radius: 10px;
     margin: 5px;
     cursor: pointer;
}