features section done

README.md

@@ -102,4 +102,36 @@ Preprocesador de css.
 [class$='col-'] {
     background-color: red;
 }
-```
+```
+
+- Select all elements but the last
+
+```css
+&:not(:last-child) {
+    //stuff
+}
+```
+
+- Select elements not hovered on continer hovered 'nombre\_\_photo'
+````css
+&:hover &__photo:not(:hover) {
+    transform: scale(0.9);
+}
+````
+
+## Bordes
+
+Borders can be achieved on a more advanced way with `outline`, it allows us to create a gap on a simple manner.
+
+- Outline
+````css
+outline-offset: 2rem;
+outline: 1.5rem solid $color-primary;
+````
+
+## Shadows
+
+- box-shadow : `box-shadow: offsetX offsetY blur color`
+```css
+box-shadow: 0 1.5rem 4rem rgba($color-black, .4);
+```