body {background: #fff ;font-family: Arial;text-align: center} 
header {background: #62bea5; width: 100%; height: :150px; padding: 20px;}
a {color: #000; text-decoration: none; padding: 20px;text-align: center }
main {background: #ffffff; width: 100%; height: 800px;text-align: : center; padding: 30px;}
footer {text-align: center}

nav ul {list-style-type: none;} 

nav ul li { display:inline;}
.espaciado { margin: 40px; padding: 40px;}
.espaciado2 { margin: 80px; padding: 40px;}