captive: Import new design

This is the new design of the access page of the captive
portal. It is based on the Bootstrap 4 grid system and
reboot but does not use anything else from it.

It is responsive and customisable.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

html/html/captive/assets/captive.css

@@ -1,76 +1,161 @@
-h1{
-	font-family: sans-serif;
-}
-
 body {
-	height: 100%;
-    background-image: url("internet.png");
-    background-size:     cover;                      /* <------ */
-    background-repeat:   no-repeat;
-    background-position: center center;
+	background-color: #eceff1;
+	color: #263238;
+
+	display: flex;
+	min-height: 100vh;
+	flex-direction: column;
 }
 
-.title{
+body, input {
+	font-family: "Ubuntu", sans-serif;
+	font-size: 14px;
+}
+
+.content {
+	flex: 1;
+}
+
+.box {
+	margin: 272px 0 48px 0;
+	padding: 0 30px 48px 30px;
+
 	position: relative;
-	background: #f5f5f5;
-	border: 1px solid #FFF;
-	width: 40em;
-	height: 6em;
-	left: 1em;
-	top: 2em;
-	padding-left: 2em;
-	padding-right: 2em;
-	padding-top: 0,5em;
-	opacity: 0.9;
-	border-radius: 5px;
-	-moz-border-radius: 5px;
-	-webkit-border-radius: 5px;
-	box-shadow: 1px 2px 4px rgba(0,0,0,.4);
+	display: flex;
+	flex-direction: column;
+	background-color: white;
+
+	border: none;
+	border-radius: 4px;
+	box-shadow:
+		0 19px 38px 0 rgba(0, 0, 0, 0.3),
+		0 15px 12px 0 rgba(0, 0, 0, 0.22);
 }
 
-.login{
+.box-header {
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	min-height: 128px;
+}
+
+.box-header h1 {
+	font-size: 40px;
+}
+
+@media (min-width: 1200px) {
+	.box-header {
+		min-height: none;
+	}
+
+	.box-header h1 {
+		margin-top: 24px;
+		margin-bottom: 20px;
+	}
+}
+
+.box-block {
+	padding: 24px 16px 24px 16px;
+	margin: 0 -8px 40px -8px;
+
+	text-align: center;
+	background-color: #b71c1c;
+	color: white;
+	border-radius: 4px;
+}
+
+@media (min-width: 1200px) {
+	.box-block {
+		padding: 18px 16px 18px 16px;
+		margin: 0 0 48px 0;
+	}
+}
+
+.box-block h4 {
+	font-size: 20px;
+}
+
+footer {
+	height: 64px;
+	background-color: rgba(84, 110, 122, 0.06); /* #546e7a */
+}
+
+.footer {
+	display: flex;
+	align-items: center;
+}
+
+.footer .logo {
+	width: 64px;
+	height: 64px;
+	padding: 8px;
+}
+
+.form-text {
+	display: inline-block;
+	height: 36px;
+
+	color: #263238;
+	background-color: rgba(38, 49, 56, 0,08);
+
+	border: 0;
+	border-radius: 2px;
+	box-shadow: inset 0 -2px 0 0 #546e7a;
+}
+
+.form-text .error {
+	box-shadow: 0 -2px 0 0 #ff3d00;
+}
+
+.form-submit {
+	display: inline-block;
+
+	font-weight: 500;
+	text-transform: uppercase;
+
+	height: 36px;
+	padding: 0 16px 0 16px;
+	margin: 0 8px 0 8px;
+
+	color: #263238;
+	background-color: white;
+
+	border: none;
+	border-radius: 2px;
+	box-shadow:
+		0 2px 4px 0 rgba(0, 0, 0, 0.16),
+		0 1px 2px 0 rgba(0, 0, 0, 0.23);
+}
+
+.form-submit:hover {
+	box-shadow:
+		0 3px 6px 0 rgba(0, 0, 0, 0.16),
+		0 3px 6px 0 rgba(0, 0, 0, 0.23);
+}
+
+.form-submit:active {
+	background-color: black;
+	opacity: 0.16;
+	box-shadow: none;
+}
+
+.checkbox {
 	position: relative;
-	background: #f5f5f5;
-	border: 1px solid #FFF;
-	width: 40em;
-	left: 1em;
-	top: 2em;
-	margin-top: 0,2em;
-	padding-left: 2em;
-	padding-right: 2em;
-	padding-top: 1em;
-	text-align: left;
-	font-family: sans-serif;
-	border-radius: 5px;
-	-moz-border-radius: 5px;
-	-webkit-border-radius: 5px;
-	box-shadow: 1px 2px 4px rgba(0,0,0,.4);
+	display: block;
+
+	margin-top: 20px;
 }
 
-.agb{
-	position: relative;
-	background: #f5f5f5;
-	border: 1px solid #FFF;
-	width: 40em;
-	left: 1em;
-	top: 2em;
-	margin-top: 0,2em;
-	padding-left: 2em;
-	padding-right: 2em;
-	padding-top: 1em;
-	text-align: left;
-	font-family: sans-serif;
-	opacity: 0.9;
-	border-radius: 5px;
-	-moz-border-radius: 5px;
-	-webkit-border-radius: 5px;
-	box-shadow: 1px 2px 4px rgba(0,0,0,.4);
-}
+.checkbox .form-checkbox {
+	position: absolute;
+	margin-top: 1px;
+	margin-left: -24px;
 
-#agbtext{
-	font-size: 12px;
-	font-weight: normal;
-	resize: none;
-	overflow-y: scroll;
-}
+	width: 20px;
+	height: 20px;
 
+	background-color: rgba(38, 49, 56, 0.08);
+
+	border: 2px solid #546e7a;
+	border-radius: 2px;
+}