*{margin: 0; padding: 0}
body{background: rgba(250, 116, 1, 0.75)}
.contenedor {width: 960px; margin: 0 auto 0 auto; }



header {background: #63eb52; height: 80px;}
nav {background:#ff36d9; height: 50px;} 
main {background: #fff; height: 800px; font-family: sans-serif}
section {background: #0085d8; height: 800px; width: 70%; position: relative; float: left}
aside {background: #7c7b77; height: 400px ; width: 30%; position: relative; float: left}
footer {background:#63eb52 ; height: 40px;} 
section article {background: #ffe200; height: 240px; width:96% ; position: relative; float: left; box-sizing: border-box; margin: 1.5%;padding: 2%}

.articulito {background: #ffe200; height: 250px; width:27% ; position: relative; float: left; box-sizing: border-box; margin: 2%;}