<h1>EsCss</h1>
<input class='hide' type="checkbox" id="uno" name="tractor" />
<label for='uno'>&#9776;</label>
<nav>
  <a href=''>uno</a>
  <a href=''>doles</a>
  <a href=''>tele</a>
  <a href=''>catole</a>
  <a href=''>kile</a>
  <a href=''>kilete</a>
  <a href=''>opciones</a>
  <a href=''>enlace</a>
  <a href=''>otro</a>
  <a href=''>libros</a>
  <a href=''>apuntes</a>
  <a href=''>pdf</a>
</nav>
<section>
  <p><span>CSS menu</span> writing-modes</p>
  <p>1 letter per line. No extra markup.</article>

<span class='aviso'>Link the <a href='https://ksesocss.blogspot.com/2015/09/una-letra-por-linea-puro-css.html'>POST</a>, show the PEN</span>

@import url(https://fonts.googleapis.com/css?family=Merriweather:400,300italic|Hind:300);
*, *:before, *:after {
  box-sizing: inherit;
}
* {margin:0;padding:0;border:0 none; position: relative;}
html {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAAEFsT2yAAAACXBIWXMAAAsSAAALEgHS3X78AAAAFElEQVR4nGNhYGBwYIET////ZwAAETIDym2lzEcAAAAASUVORK5CYII=), url(https://2.bp.blogspot.com/-Kd55Z83gyvM/UpD8A6qj6CI/AAAAAAAAH20/eV8YvYCDAvE/s1600/mult-lab1.jpg);
  background-size: 2px 2px, cover;
  background-repeat: repeat, none;
  background-position: 0 0;
  min-height: 100%;
  box-sizing: border-box;
  font-family: hind, sans-serif;
  font-weight: 300;
  color: #15BFCC;
}
body {
  background: inherit;
  height: 100vh;
  padding-left: calc(9.5vh * 1.5);
  display: flex;
}
h1 {
  background: rgba(13,117,125,.5);
  position: fixed;
  left: 0;
  top: 0;
  font-size: 9.5vh;
  font-family: Merriweather, serif;
  font-weight: 400;
  line-height: 1.5;
  text-shadow: -3px -2px 0 #000;
  box-shadow: 1px 0 0px rgba(255,255,255,.4);
  writing-mode: vertical-lr;
  -webkit-text-orientation: upright;
  -moz-text-orientation: upright;
  text-orientation: upright;
  height: 100vh;
  text-align: center;
}
[for='uno'] {
  background: #FF7361;
  position: fixed;
  bottom: 0;
  right: 0;
  font-size: 3rem;
  width: 100px;
  height: 100px;
  line-height: 110px;
  color: #444;
  text-align: center;
  border-radius: 50%;
  cursor: pointer;
}
nav {
  display: flex;
  justify-content: space-around;
  width: calc(100% - 10vw);
  position: fixed;
  top: -100%;
  transition: 600ms;
  z-index: 1;

}
#uno:checked ~ nav {
  top: 0%;
}
nav a {
  background: linear-gradient(to top, rgba(0,0,0,.3) 50%, rgba(21,191,204,.6) 51%);
  background-size: 100% 205%;
  background-position: 0 100%;
  color: #fff;
  font-family: hind;
  font-weight: 300;
  font-size: 2rem;
  font-variant: small-caps;
  text-decoration: none;
  padding: 1rem 0;
  writing-mode: vertical-rl;
  -webkit-text-orientation: upright;
  -moz-text-orientation: upright;
 text-orientation: upright;
  box-shadow: 0 0 1px #f0f0f0;
  border-radius: 0 0 2rem 2rem;
  transition: .5s;
  height: max-content;
  letter-spacing: -5rem;
  transition: letter-spacing .5s .5s;
}
#uno:checked ~ nav a {
  letter-spacing: 1px;
}
nav a:hover {
  background-position: 0 0;  
}

section {
  background: rgba(21,191,204,.35);
  background-clip: content-box;
  font-family: Merriweather, serif;
  font-weight: 300;
  font-style: italic;
  font-size: 4rem;
  text-align: center;
  margin: auto;
  padding: 2vmax;
  border: 2vmax solid rgba(13,117,125,.5);
}

section span {
  display: block;
}
section p + p {
  font-size: 2rem;
  padding: 0 1rem;
}
.hide {
  display: none;
}

.aviso {
  position: fixed;
  bottom: 0;
  left: calc(9.5vh * 1.6);
  background: #FF7361;
  color: #fff;
  font-family: hind;
  font-style: normal;
  font-size: 1rem;
  font-weight: 300;
  padding: .5rem;
  border-radius: 5px 0 0;
  box-shadow: 0 0 4px rgba(0,0,0,.4);
  z-index: 100;
}
.aviso a {
  text-decoration: none;
  color: #000;
}