html {
    box-sizing: border-box;
    background: #eeeeee;
    font-family: 'helvetica neue';
    font-size: 20px;
    font-weight: 200;
}
  
body {
    margin: 0;
}
  
*, *:before, *:after {
    box-sizing: inherit;
}
  
.site-wrap {
    max-width: 700px;
    margin: 70px auto;
    background: white;
    padding: 40px;
    text-align: justify;
    box-shadow: 0 0 10px 5px rgba(0, 0, 0, 0.05);
    transform: scale(0.98);
    transition: transform 0.5s;
}
  
body.fixed-nav .site-wrap {
    transform: scale(1); /*Efecto*/
}
  
header {
    text-align: center;
    height: 500px;
    background: url(https://i.blogs.es/edd5d2/2560_3000/1366_2000.jpeg);
    background-size: cover;
    display: flex;
    align-items: center;
    justify-content: center;
}
  
h1 {
    color: white;
    font-size: 7vw;
    text-shadow: 3px 4px 0 rgba(0,0,0,0.2);
}
  
nav {
    background: black;
    top: 0;
    width: 100%;
    transition:all 0.5s;
    position: relative;
    z-index: 1;
}
  
body.fixed-nav nav {
    position: fixed; /*Arreglar el navegador para que bloquee bien al bajar*/
    box-shadow: 0 5px 0 rgba(0,0,0,0.1);
}
  
nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
}
  
nav li {
    flex: 1;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
}
  
li.logo {
    max-width: 0;
    overflow: hidden;
    background: white;
    transition: all 0.5s;
    font-weight: 600;
    font-size: 30px;
}
  
li.logo a {
    color: black;
}
  
.fixed-nav li.logo {
    max-width: 500px; /*La transicion si debe hacerse con numero ya que auto no funciona*/
}
  
nav a {
    text-decoration: none;
    padding: 20px;
    display: inline-block;
    color: white;
    transition: all 0.2s;
    text-transform: uppercase;
}