body{
background: repeating-linear-gradient(50deg, lightcyan, lightcyan 10px, white 10px, white 20px);
font-family: "Arial";
}

header{
background: repeating-linear-gradient(180deg, lightcyan, deepskyblue);
}

nav{
background: white;
padding: 10px;
border-bottom: solid 2px deepskyblue;
}

nav a{
color: black;
text-decoration: none;
padding: 10px;
background: linear-gradient(180deg, white 20px, #ebebeb);
}

main {
border: ridge 7px #87efff;
background: white;
border-radius: 10px;
width: 670px;
margin: auto;
}

.contenido{
padding: 5px;
}