*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{
    background:#121212;
    color:white;
    font-family:Arial;
}

header{
    text-align:center;
    padding:60px;
}

nav{
    background:#1f1f1f;
    padding:20px;
    text-align:center;
}

nav a{
    color:white;
    text-decoration:none;
    margin:20px;
}

section{
    padding:40px;
}

.tarjeta{
    background:#1d1d1d;
    padding:20px;
    margin-top:20px;
    border-radius:10px;
}

ul{
    margin-left:30px;
}

a{
    color:#4da6ff;
}

footer{
    text-align:center;
    padding:30px;
    background:black;
}