Issue 6210 - Implement Subscription (Double-opt-in) template for newsletter

css/main.css

+.unstyled, .unstyled * { margin: 0 !important; padding: 0 !important; border: 0 !important; background: none !important; list-style: none !important; }
+
+.sr-only { position: absolute !important; overflow: hidden !important; clip: rect(0, 0, 0, 0) !important; width: 1px !important; height: 1px !important; margin: -1px !important; padding: 0 !important; border: 0 !important; }
+
+/** Center within a responsive fixed width Use modifier classes defined in _width.scss to change said fixed width */
+.container { width: 1140px; max-width: 100%; margin-right: auto; margin-left: auto; padding-right: 1em; padding-left: 1em; }
+
+/** Clear without collapsed margin */
+.clearfix:after, .clearfix:before { display: table; content: " "; }
+
+.clearfix:after { clear: both; }
+
+/** Align a block to the start of a line */
+.float-start { float: left; }
+
+[dir="rtl"] .float-start { float: right; }
+
+/** Align a block to the end of a line */
+.float-end { float: right; }
+
+[dir="rtl"] .float-end { float: left; }
+
+/** Force full-width  */
+.full-width { display: block; width: 100%; }
+
+/** Fix a block to the width of a phone */
+.phone-width { width: auto; }
+
+/** Fix a block to the width of a phablet */
+.phablet-width { width: 540px; }
+
+/** Fix a block to the width of a tablet */
+.tablet-width { width: 720px; }
+
+/** Fix a block to the width of a desktop */
+.desktop-width { width: 960px; }
+
+/** Fix a block to the width of a large desktop */
+.large-desktop-width { width: 1140px; }
+
+/******************************************************************************* CSS Reset */
+/* Reset margins, paddings, and font globally */
+html, body, h1, h2, h3, h4, h5, h6, a, p, span, em, small, strong, sub, sup, strike, s, mark, del, ins, abbr, dfn, blockquote, q, cite, code, pre, kbd, samp, var, output, ruby, ol, ul, li, dl, dt, dd, div, section, article, main, aside, nav, header, hgroup, footer, img, figure, figcaption, address, time, audio, video, canvas, object, iframe, embed, details, summary, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td { margin: 0px; padding: 0px; border: 0px; font-size: 100%; font: inherit; vertical-align: baseline; }
+
+/* Add the correct display in IE 9-. */
+article, aside, footer, header, nav, section, main { display: block; }
+
+/* Set default box-sizing (opinionated) */
+*, *:before, *:after { box-sizing: inherit; }
+
+html { box-sizing: border-box; }
+
+/* Remove the margin in all browsers (opinionated). */
+body { margin: 0px; }
+
+/* Remove list styles (opinionated) */
+ol, ul { list-style: none; }
+
+/* Remove quotes ("") in most browsers (opinionated) */
+blockquote, q { quotes: none; }
+
+/* Remove quotes ("") in Safari (opinionated) */
+blockquote:before, blockquote:after, q:before, q:after { content: ""; content: none; }
+
+/* Share borders between adjacent cells (opinionated) */
+table { border-collapse: collapse; border-spacing: 0; }
+
+/* Normalize inline content (opinionated) */
+b, strong { font-weight: bolder; }
+
+small { font-size: smaller; }
+
+abbr { text-decoration: underline; cursor: help; }
+
+sup { position: relative; font-size: 75%; vertical-align: super; }
+
+a, a:visited { color: inherit; /* Remove the gray background on active links in IE 10. */ background-color: transparent; text-decoration: none; /* Set default pointer regardless of href (opinionated) */ cursor: pointer; }
+
+a:hover, a:active, a:focus { text-decoration: underline; }
+
+img { /* Make fixed width images responsive */ max-width: 100%; /* Remove the border on images inside links in IE 10-. */ border-style: none; }
+
+/* Set correct display for hidden attribute in IE 10-  */
+[hidden] { display: none; }
+
+/******************************************************************************* Base styles */
+html { color: #212121; background-color: #fff; font-family: "Source Sans Pro", sans-serif; line-height: 1.5; }
+
+/******************************************************************************* Basic forms fields /* 1. Reset */
+/* Change the font styles in all browsers (opinionated). */
+input, optgroup, select, textarea { font: inherit; }
+
+/* Show the overflow in IE and Edge */
+input { overflow: visible; }
+
+/* Remove the inheritance of text transform in Edge, Firefox, and IE. */
+select { text-transform: none; }
+
+/* Set block display (opinionated) */
+fieldset { display: block; }
+
+/* Correct the text wrapping in Edge and IE. */
+legend { display: table; max-width: 100%; white-space: normal; }
+
+/* Remove the default vertical scrollbar in IE. */
+textarea { overflow: auto; }
+
+/* Remove the padding in IE 10-. */
+[type="checkbox"], [type="radio"] { padding: 0px; }
+
+/******************************************************************************* Buttons /* 1. Reset */
+button { margin: 0px; color: inherit; font: inherit; /* Show the overflow in IE and Edge */ overflow: visible; /* Remove rounded corners in Chrome 62+ */ border-radius: 0; /* Remove the inheritance of text transform in Edge, Firefox, and IE. */ text-transform: none; }
+
+/** 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 and Safari. */
+button, html [type="button"], [type="reset"], [type="submit"] { -webkit-appearance: button; }
+
+/* Remove the inner border and padding in Firefox. */
+button::-moz-focus-inner, [type="button"]::-moz-focus-inner, [type="reset"]::-moz-focus-inner, [type="submit"]::-moz-focus-inner { padding: 0px; border-style: none; }
+
+/* Restore the focus styles unset by the previous rule. */
+button:-moz-focusring, [type="button"]:-moz-focusring, [type="reset"]:-moz-focusring, [type="submit"]:-moz-focusring { outline: 1px dotted ButtonText; }
+
+/******************************************************************************* Layout */
+html { background-color: #F3F3F3; }
+
+@media (min-width: 576px) { body { display: table; width: 100%; min-height: 100vh; } }
+
+/* .outer-container */
+@media (min-width: 576px) { .outer-container { display: table-cell; vertical-align: middle; } }
+
+/* #page-header */
+#page-header { margin-top: 2em; margin-bottom: 1em; }
+
+@media (min-width: 576px) { #page-header { margin-top: 0; margin-bottom: 2em; text-align: center; } }
+
+#page-header figure { display: inline-table; font-size: 1.5em; font-weight: 300; }
+
+@media (min-width: 576px) { #page-header figure { font-size: 2em; } }
+
+#page-header figure img, #page-header figure figcaption { display: table-cell; vertical-align: middle; }
+
+#page-header figure img { height: 1.5em; }
+
+@media (min-width: 576px) { #page-header figure img { height: 2em; } }
+
+#page-header figure figcaption { padding: 0 0.5em; }
+
+#page-header figure strong { font-weight: 700; }
+
+#page-header h1 { margin: 1em auto 0.5em; font-weight: 700; }
+
+/* #sign-up, #page-footer */
+#sign-up, #page-footer { width: 100%; }
+
+@media (min-width: 576px) { #sign-up, #page-footer { max-width: 320px; margin-right: auto; margin-left: auto; } }
+
+#page-footer { margin-top: 1em; text-align: center; }
+
+@media (min-width: 576px) { #page-footer { text-align: left; } }
+
+/******************************************************************************* Content */
+a, a:visited { color: #077CA6; text-decoration: underline; }
+
+/******************************************************************************* Form */
+input, button { width: 100%; height: 2.6em; border-radius: 4px; }
+
+/* Input field */
+input { margin-bottom: 2em; padding: 0 0.5em; border: 1px solid #CDCDCD; }
+
+/* Error state */
+.invalid { border-color: #f44336; }
+
+.error-message { display: none; }
+
+.invalid + .error-message { display: block; margin-top: -0.5em; margin-bottom: 1em; color: #f44336; }
+
+/* Buttons */
+button { border: 0; text-transform: uppercase; }
+
+.secondary { color: #fff; background-color: #C70D2B; }