Also convert template body-background-image to var()

And cleanup more CSS

vendors/normalize.css/normalize.css

@@ -3,27 +3,6 @@
 /* Document
    ========================================================================== */
 
-/**
- * 1. Correct the line height in all browsers.
- * 2. Prevent adjustments of font size after orientation changes in iOS.
- */
-
-html {
-  line-height: 1.15; /* 1 */
-  -webkit-text-size-adjust: 100%; /* 2 */
-}
-
-/* Sections
-   ========================================================================== */
-
-/**
- * Remove the margin in all browsers.
- */
-
-body {
-  margin: 0;
-}
-
 /**
  * Correct the font size and margin on `h1` elements within `section` and
  * `article` contexts in Chrome, Firefox, and Safari.
@@ -61,7 +40,7 @@ pre {
 
 /**
  * 1. Remove the bottom border in Chrome 57-
- * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
+ * 2. Add the correct text decoration in Chrome, Edge, Opera, and Safari.
  */
 
 abbr[title] {
@@ -139,7 +118,7 @@ textarea {
 }
 
 /**
- * Remove the inheritance of text transform in Edge, Firefox, and IE.
+ * Remove the inheritance of text transform in Edge, Firefox.
  * 1. Remove the inheritance of text transform in Firefox.
  */
 
@@ -183,33 +162,12 @@ button:-moz-focusring,
 }
 
 /**
- * Correct the padding in Firefox.
- */
-
-fieldset {
-  padding: 0.35em 0.75em 0.625em;
-}
-
-/**
- * 1. Correct the text wrapping in Edge and IE.
  * 3. Remove the padding so developers are not caught out when they zero out
  *    `fieldset` elements in all browsers.
  */
 
 legend {
-  box-sizing: border-box; /* 1 */
-  display: table; /* 1 */
-  max-width: 100%; /* 1 */
   padding: 0; /* 3 */
-  white-space: normal; /* 1 */
-}
-
-/**
- * Add the correct vertical alignment in Chrome, Firefox, and Opera.
- */
-
-progress {
-  vertical-align: baseline;
 }
 
 /**
@@ -248,22 +206,3 @@ progress {
   -webkit-appearance: button; /* 1 */
   font: inherit; /* 2 */
 }
-
-/* Interactive
-   ========================================================================== */
-
-/*
- * Add the correct display in Edge, IE 10+, and Firefox.
- */
-
-details {
-  display: block;
-}
-
-/*
- * Add the correct display in all browsers.
- */
-
-summary {
-  display: list-item;
-}