[IMP] portal, web: move wrapwrap flex style rules from portal to web

This commit moves the flex rules of #wrapwrap div to web so it can be used in
survey.

This is needed to make the survey footer stick to the bottom of the screen
even if main has not enough content to fill the page.

This commit prepares survey redesign.

Task ID: '2150291'
PR #43237

addons/portal/static/src/scss/portal.scss

@@ -24,21 +24,6 @@ $o-portal-bg-color: desaturate($gray-200, 100%);
 $o-portal-use-default-colors: $body-bg == $o-portal-default-body-bg;
 
 // Frontend general
-#wrapwrap {
-    position: relative;
-    display: flex;
-    flex-flow: column nowrap;
-    width: 100%;
-    min-height: 100%;
-
-    > * {
-        flex: 0 0 auto;
-    }
-    > main {
-        flex: 1 0 auto;
-    }
-}
-
 header {
     .navbar-brand {
         flex: 0 0 auto;

addons/web/static/src/scss/base_frontend.scss

@@ -0,0 +1,15 @@
+// Frontend general
+#wrapwrap {
+    position: relative;
+    display: flex;
+    flex-flow: column nowrap;
+    width: 100%;
+    min-height: 100%;
+
+    > * {
+        flex: 0 0 auto;
+    }
+    > main {
+        flex: 1 0 auto;
+    }
+}

addons/web/views/webclient_templates.xml

@@ -399,6 +399,7 @@
         </t>
 
         <t t-call="web._assets_bootstrap"/>
+        <link rel="stylesheet" type="text/scss" href="/web/static/src/scss/base_frontend.scss"/>
         <link rel="stylesheet" type="text/scss" href="/web/static/src/scss/lazyloader.scss"/>
         <link rel="stylesheet" type="text/scss" href="/web/static/src/scss/navbar_mobile.scss"/>
         <link rel="stylesheet" type="text/scss" href="/web/static/src/scss/notification.scss"/>