diff --git a/normalize.css b/normalize.css
index eb8610a..0919059 100644
--- a/normalize.css
+++ b/normalize.css
@@ -1,9 +1,8 @@
 /*! normalize.css v3.0.3 | MIT License | github.com/necolas/normalize.css */
 
 /**
- * 1. Set default font family to sans-serif (opinionated).
- * 2. Prevent iOS and IE text size adjust after device orientation change,
- *    without disabling user zoom.
+ * 1. Change the default font family in all browsers (opinionated).
+ * 2. Prevent adjustments of font size after orientation changes in IE and iOS.
  */
 
 html {
@@ -13,7 +12,7 @@ html {
 }
 
 /**
- * Remove default margin (opinionated).
+ * Remove the margin in all browsers (opinionated).
  */
 
 body {
@@ -24,42 +23,39 @@ body {
    ========================================================================== */
 
 /**
- * Correct `block` display not defined for any HTML5 element in IE 8/9.
- * Correct `block` display not defined for `details` or `summary` in IE 10/11
- * and Firefox.
- * Correct `block` display not defined for `main` in IE 11.
+ * Add the correct display in IE 9-.
+ * 1. Add the correct display in Edge, IE, and Firefox.
+ * 2. Add the correct display in IE.
  */
 
 article,
 aside,
-details,
+details, /* 1 */
 figcaption,
 figure,
 footer,
 header,
-main,
+main, /* 2 */
 menu,
 nav,
 section,
-summary {
+summary { /* 1 */
   display: block;
 }
 
 /**
- * 1. Correct `inline-block` display not defined in IE 8/9.
- * 2. Normalize vertical alignment of `progress` in Chrome, Firefox, and Opera.
+ * Add the correct display in IE 9-.
  */
 
 audio,
 canvas,
 progress,
 video {
-  display: inline-block; /* 1 */
-  vertical-align: baseline; /* 2 */
+  display: inline-block;
 }
 
 /**
- * Prevent displaying `audio` without controls in Mobile Safari 4/5/6/7.
+ * Add the correct display in iOS 4-7.
  */
 
 audio:not([controls]) {
@@ -68,12 +64,20 @@ audio:not([controls]) {
 }
 
 /**
- * Address `[hidden]` styling not present in IE 8/9/10.
- * Hide the `template` element in IE 8/9/10/11, Safari, and Firefox < 22.
+ * Add the correct vertical alignment in Chrome, Firefox, and Opera.
  */
 
-[hidden],
-template {
+progress {
+  vertical-align: baseline;
+}
+
+/**
+ * Add the correct display in IE 10-.
+ * 1. Add the correct display in IE.
+ */
+
+template, /* 1 */
+[hidden] {
   display: none;
 }
 
@@ -81,7 +85,7 @@ template {
    ========================================================================== */
 
 /**
- * Remove the gray background color from active links in IE 10.
+ * Remove the gray background on active links in IE 10.
  */
 
 a {
@@ -89,8 +93,8 @@ a {
 }
 
 /**
- * Improve readability of focused elements when they are also in an
- * active/hover state (opinionated).
+ * Remove the outline on focused links when they are also active or hovered
+ * in all browsers (opinionated).
  */
 
 a:active,
@@ -102,9 +106,8 @@ a:hover {
    ========================================================================== */
 
 /**
- * Address inconsistent styling of `abbr[title]`.
- * 1. Correct styling in Firefox 39 and Opera 12.
- * 2. Correct missing styling in Chrome, Edge, IE, Opera, and Safari.
+ * 1. Remove the bottom border in Firefox 39-.
+ * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
  */
 
 abbr[title] {
@@ -114,23 +117,25 @@ abbr[title] {
 }
 
 /**
- * Address inconsistent styling of b and strong.
- * 1. Correct duplicate application of `bolder` in Safari 6.0.2.
- * 2. Correct style set to `bold` in Edge 12+, Safari 6.2+, and Chrome 18+.
+ * Prevent the duplicate application of `bolder` by the next rule in Safari 6.
  */
 
 b,
 strong {
-  font-weight: inherit; /* 1 */
-}
-
-b,
-strong {
-  font-weight: bolder; /* 2 */
+  font-weight: inherit;
 }
 
 /**
- * Address styling not present in Android < 4.4.
+ * Add the correct font weight in Chrome, Edge, and Safari.
+ */
+
+b,
+strong {
+  font-weight: bolder;
+}
+
+/**
+ * Add the correct font style in Android 4.3-.
  */
 
 dfn {
@@ -138,8 +143,8 @@ dfn {
 }
 
 /**
- * Address variable `h1` font-size and margin within `section` and `article`
- * contexts in Firefox 4+, Safari, and Chrome.
+ * Correct the font size and margin on `h1` elements within `section` and
+ * `article` contexts in Chrome, Firefox, and Safari.
  */
 
 h1 {
@@ -148,7 +153,7 @@ h1 {
 }
 
 /**
- * Address styling not present in IE 8/9.
+ * Add the correct background and color in IE 9-.
  */
 
 mark {
@@ -157,7 +162,7 @@ mark {
 }
 
 /**
- * Address inconsistent and variable font size in all browsers.
+ * Add the correct font size in all browsers.
  */
 
 small {
@@ -165,7 +170,8 @@ small {
 }
 
 /**
- * Prevent `sub` and `sup` affecting `line-height` in all browsers.
+ * Prevent `sub` and `sup` elements from affecting the line height in
+ * all browsers.
  */
 
 sub,
@@ -176,19 +182,19 @@ sup {
   vertical-align: baseline;
 }
 
-sup {
-  top: -0.5em;
-}
-
 sub {
   bottom: -0.25em;
 }
 
+sup {
+  top: -0.5em;
+}
+
 /* Embedded content
    ========================================================================== */
 
 /**
- * Correct border-style given when inside `a` element in IE 8/9/10.
+ * Remove the border on images inside links in IE 10-.
  */
 
 img {
@@ -196,7 +202,7 @@ img {
 }
 
 /**
- * Correct overflow not hidden in IE 9/10/11.
+ * Hide the overflow in IE.
  */
 
 svg:not(:root) {
@@ -207,28 +213,8 @@ svg:not(:root) {
    ========================================================================== */
 
 /**
- * Address margin not present in IE 8/9 and Safari.
- */
-
-figure {
-  margin: 1em 40px;
-}
-
-/**
- * Address inconsistent styling of `hr`.
- * 1. Correct `box-sizing` set to `border-box` in Firefox.
- * 2. Correct `overflow` set to `hidden` in IE 8/9/10/11 and Edge 12.
- */
-
-hr {
-  box-sizing: content-box; /* 1 */
-  height: 0; /* 1 */
-  overflow: visible; /* 2 */
-}
-
-/**
- * 1. Correct inheritance and scaling of font-size for preformatted text.
- * 2. Address odd `em`-unit font size rendering in all browsers.
+ * 1. Correct the inheritance and scaling of font size in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
  */
 
 code,
@@ -239,63 +225,83 @@ samp {
   font-size: 1em; /* 2 */
 }
 
+/**
+ * Add the correct margin in IE 8.
+ */
+
+figure {
+  margin: 1em 40px;
+}
+
+/**
+ * 1. Add the correct box sizing in Firefox.
+ * 2. Show the overflow in Edge and IE.
+ */
+
+hr {
+  box-sizing: content-box; /* 1 */
+  height: 0; /* 1 */
+  overflow: visible; /* 2 */
+}
+
 /* Forms
    ========================================================================== */
 
 /**
- * Known limitation: by default, Chrome and Safari on OS X allow very limited
- * styling of `select`, unless a `border` property is set.
- */
-
-/**
- * 1. Correct font properties not being inherited.
- * 2. Address margins set differently in Firefox 4+, Safari, and Chrome.
+ * Change font properties to `inherit` in all browsers (opinionated).
  */
 
 button,
 input,
-optgroup,
 select,
 textarea {
-  font: inherit; /* 1 */
-  margin: 0; /* 2 */
+  font: inherit;
 }
 
 /**
- * Address `overflow` set to `hidden` in IE 8/9/10/11.
+ * Restore the font weight unset by the previous rule.
  */
 
-button {
+optgroup {
+  font-weight: bold;
+}
+
+/**
+ * Show the overflow in IE.
+ * 1. Show the overflow in Edge.
+ * 2. Show the overflow in Edge, Firefox, and IE.
+ */
+
+button,
+input, /* 1 */
+select { /* 2 */
   overflow: visible;
 }
 
 /**
- * Address inconsistent `text-transform` inheritance for `button` and `select`.
- * All other form control elements do not inherit `text-transform` values.
- * Correct `button` style inheritance in Firefox, IE 8/9/10/11, and Opera.
- * Correct `select` style inheritance in Firefox.
+ * Remove the margin in Safari.
+ * 1. Remove the margin in Firefox and Safari.
  */
 
 button,
-select {
+input,
+select,
+textarea { /* 1 */
+  margin: 0;
+}
+
+/**
+ * Remove the inheritence of text transform in Edge, Firefox, and IE.
+ * 1. Remove the inheritence of text transform in Firefox.
+ */
+
+button,
+select { /* 1 */
   text-transform: none;
 }
 
 /**
- * 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio`
- *    and `video` controls.
- * 2. Correct inability to style clickable `input` types in iOS.
- */
-
-button,
-html [type="button"], /* 1 */
-[type="reset"],
-[type="submit"] {
-  -webkit-appearance: button; /* 2 */
-}
-
-/**
- * Improve consistency of cursor style between image-type `input` and others.
+ * Change the cursor in all browsers (opinionated).
  */
 
 button,
@@ -306,7 +312,7 @@ button,
 }
 
 /**
- * Re-set default cursor for disabled elements.
+ * Restore the default cursor to disabled elements unset by the previous rule.
  */
 
 [disabled] {
@@ -314,7 +320,20 @@ button,
 }
 
 /**
- * Remove inner padding and border in Firefox 4+.
+ * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
+ *    controls in Android 4.
+ * 2. Correct the inability to style clickable types in iOS.
+ */
+
+button,
+html [type="button"], /* 1 */
+[type="reset"],
+[type="submit"] {
+  -webkit-appearance: button; /* 2 */
+}
+
+/**
+ * Remove the inner border and padding in Firefox.
  */
 
 button::-moz-focus-inner,
@@ -324,7 +343,7 @@ input::-moz-focus-inner {
 }
 
 /**
- * Restore focus style in Firefox 4+ (unset by a rule above)
+ * Restore the focus styles unset by the previous rule.
  */
 
 button:-moz-focusring,
@@ -333,51 +352,7 @@ input:-moz-focusring {
 }
 
 /**
- * It's recommended that you don't attempt to style these elements.
- * Firefox's implementation doesn't respect box-sizing, padding, or width.
- *
- * 1. Address box sizing set to `content-box` in IE 8/9/10.
- * 2. Remove excess padding in IE 8/9/10.
- */
-
-[type="checkbox"],
-[type="radio"] {
-  box-sizing: border-box; /* 1 */
-  padding: 0; /* 2 */
-}
-
-/**
- * Fix the cursor style for Chrome's increment/decrement buttons. For certain
- * `font-size` values of the `input`, it causes the cursor style of the
- * decrement button to change from `default` to `text`.
- */
-
-[type="number"]::-webkit-inner-spin-button,
-[type="number"]::-webkit-outer-spin-button {
-  height: auto;
-}
-
-/**
- * Address `appearance` set to `searchfield` in Safari and Chrome.
- */
-
-[type="search"] {
-  -webkit-appearance: textfield;
-}
-
-/**
- * Remove inner padding and search cancel button in Safari and Chrome on OS X.
- * Safari (but not Chrome) clips the cancel button when the search input has
- * padding (and `textfield` appearance).
- */
-
-[type="search"]::-webkit-search-cancel-button,
-[type="search"]::-webkit-search-decoration {
-  -webkit-appearance: none;
-}
-
-/**
- * Define consistent border, margin, and padding.
+ * Change the border, margin, and padding in all browsers (opinionated).
  */
 
 fieldset {
@@ -387,9 +362,10 @@ fieldset {
 }
 
 /**
- * 1. Correct wrapping not present in IE8/9/10/11 and Edge 12/13.
- * 2. Correct `color` not being inherited from fieldset in IE 8/9/10/11.
- * 3. Remove padding so people aren't caught out if they zero out fieldsets.
+ * 1. Correct the text wrapping in Edge and IE.
+ * 2. Correct the color inheritance from `fieldset` elements in IE.
+ * 3. Remove the padding so developers are not caught out when they zero out
+ *    `fieldset` elements in all browsers.
  */
 
 legend {
@@ -402,7 +378,7 @@ legend {
 }
 
 /**
- * Remove default vertical scrollbar in IE 8/9/10/11.
+ * Remove the default vertical scrollbar in IE.
  */
 
 textarea {
@@ -410,10 +386,39 @@ textarea {
 }
 
 /**
- * Restore font weight (unset by a rule above).
- * NOTE: the default cannot safely be changed in Chrome and Safari on OS X.
+ * 1. Add the correct box sizing in IE 10-.
+ * 2. Remove the padding in IE 10-.
  */
 
-optgroup {
-  font-weight: bold;
+[type="checkbox"],
+[type="radio"] {
+  box-sizing: border-box; /* 1 */
+  padding: 0; /* 2 */
+}
+
+/**
+ * Correct the cursor style of increment and decrement buttons in Chrome.
+ */
+
+[type="number"]::-webkit-inner-spin-button,
+[type="number"]::-webkit-outer-spin-button {
+  height: auto;
+}
+
+/**
+ * Correct the odd appearance of search inputs in Chrome and Safari.
+ */
+
+[type="search"] {
+  -webkit-appearance: textfield;
+}
+
+/**
+ * Remove the inner padding and cancel buttons in Chrome on OS X and
+ * Safari on OS X.
+ */
+
+[type="search"]::-webkit-search-cancel-button,
+[type="search"]::-webkit-search-decoration {
+  -webkit-appearance: none;
 }