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

/* Estilos generales */
 
body {font-family: Arial;}
header { color: #000000; background: #4b6f93; padding:1rem; } 

.Inicio{display: flex; justify-content: space-around;}
.columna-1 {background: #a5caf0; padding: 1.5rem; width: 33%;}
.columna-2 {background: #638eba; padding: 1.5rem; width: 33%;}
.columna-3 {background: #6486a8; padding: 1.5rem; width: 34%;}

/* Menu */
nav {background: #90a7be; padding: 1rem;}
nav ul li {display: inline-block;}
nav ul li a {color: #000000; text-decoration: none; background: #90a7be; padding: 1rem;}
.link-activo {background: #abb5bf;}

footer {background: #4b6f93; padding; 1rem;}
footer p{font-size: 0.8rem; color:black;padding:0.5rem;}