diff --git a/Natours/starter/css/style.css b/Natours/starter/css/style.css
index fb0491f..b8ad463 100644
--- a/Natours/starter/css/style.css
+++ b/Natours/starter/css/style.css
@@ -47,11 +47,13 @@ body {
     top: 40%;
     left: 50%;
     transform: translate(-50%,-50%);
+    text-align: center;
 }
 
 .heading-primary {
     color: #fff;
     text-transform: uppercase;
+    margin-bottom: 60px;
 }
 
 .heading-primary-main {
@@ -59,6 +61,9 @@ body {
     font-size: 60px;
     font-weight: 400;
     letter-spacing: 35px;
+    animation-name: slideLeft;
+    animation-duration: 1s;
+    animation-timing-function: ease-in;
 }
 
 .heading-primary-sub {
@@ -66,4 +71,104 @@ body {
     font-size: 22px;
     font-weight: 700;
     letter-spacing: 16px;
+    animation-name: slideRight;
+    animation-duration: 1s;
+    animation-timing-function: ease-in;
 }
+
+@keyframes slideLeft {
+    0% {
+        transform: translateX(-160px);
+        opacity: 0;
+    }
+
+    80% {
+        transform: translateX(15px);
+    }
+
+    100% {
+        transform: translateX(0);
+        opacity: 1;
+    }
+}
+
+@keyframes slideRight {
+    0% {
+        transform: translateX(160px);
+        opacity: 0;
+    }
+
+    80% {
+        transform: translateX(-15px);
+    }
+
+    100% {
+        transform: translateX(0);
+        opacity: 1;
+    }
+}
+
+@keyframes slideBottom {
+    0% {
+        transform: translateY(50px);
+        opacity: 0;
+    }
+
+    100% {
+        transform: translateY(0);
+        opacity: 1;
+    }
+}
+
+.btn:link,
+.btn:visited {
+    text-transform: uppercase;
+    text-decoration: none;
+    padding: 15px 40px;
+    display: inline-block;
+    border-radius: 100px;
+    transition: all 0.2s;
+    position: relative;
+}
+
+.btn-animated {
+    animation: slideBottom 0.7s ease-out .75s;
+    animation-fill-mode: backwards;
+}
+
+.btn:hover {
+    transform: translateY(-4px);
+    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
+}
+
+.btn:active {
+    transform: translateY(-1px);
+    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
+}
+
+.btn-white {
+    background-color: #fff;
+    color: #777;
+}
+
+.btn::after {
+    content: "";
+    display: inline-block;
+    height: 100%;
+    width: 100%;
+    border-radius: 100px;
+    position: absolute;
+    top: 0;
+    left: 0;
+    z-index: -1;
+    transition: all 0.4s;
+}
+
+.btn-white::after{
+    background-color: #fff;
+}
+
+.btn:hover::after {
+    transform: scaleX(1.4) scaleY(1.6);
+    opacity: 0;
+}
\ No newline at end of file
diff --git a/Natours/starter/index.html b/Natours/starter/index.html
index 6f9e183..970972c 100644
--- a/Natours/starter/index.html
+++ b/Natours/starter/index.html
@@ -22,6 +22,8 @@
                     <span class="heading-primary-main">outdoors</span>
                     <span class="heading-primary-sub">is where life happens</span>
                 </h1>
+
+                <a href="#" class="btn btn-white btn-animated">Discover our tours</a>
             </div>
         </header>
     </body>
diff --git a/README.md b/README.md
index 0ee4944..506b82b 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
 # Anotaciones
 - Una imagen es un 'inline-element' por lo que es recomendable insertarla en un div para manejarla.
 - Un 'block' ocupa todo el espacio que tiene disponible y crea saltos de línea antes y después.
+
+## Pseudo-elementos
+Estados especiales de un selector (:hover, :link, etc.)
+::after -> Add a virtual element 'after' el elemento