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

body {
    width: 80%;
    margin: auto;

}

header{
    height: 115px;
    border: 1px solid #666;
    background-color: #00ff00;
  }
  nav {display: flex; justify-content: flex-end}
nav{background: #363636;}
nav ul{display: flex;}
nav ul li{list-style-type: none}
nav ul li a{padding: 1rem; background: #ccc; margin: 1rem; text-decoration: none; color: black;}
nav ul li a:hover{background: #460086; color: #fff;}

h1 {
    text-align: center;
    margin: 20px}
p {
    margin-bottom: 25px;
}

main {
    border:2px solid #0000ff;
    height: 520px;
    display: flex;
    flex-direction: row;
    padding-top: 5px;
    }

section{
    background-color:#add8e6;
    height:100%;
    flex:2;
    display:flex;
    flex-direction: column;
    padding-top:50px;

}

section .article-row {
    display:flex;
    flex:1;
    flex-direction: row;

}
article {
    flex:1;
    background-color: #ffA500;
    margin: 5px 10px;
    
    
}

aside{
    background-color:#a9a9a9;
    height:100%;
    flex:1;
    margin-left:5px;

}

.datosobligatorios{
    width: 70%;
    margin: auto;
}

footer{
        width: 70%;
        margin: auto;
  }