Issue 5848 - Fix vertical alignment on .heading-icon images in help.eyeo.com

static/scss/components/_pre-icon.scss

+// This file is part of help.eyeo.com.
+// Copyright (C) 2017 Eyeo GmbH
+//
+// help.eyeo.com is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// help.eyeo.com is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with help.eyeo.com.  If not, see <http://www.gnu.org/licenses/>.
+
+// Pre Icon //////////////////////////////////////////////////////////////////
+
+.has-pre-icon
+{
+  position: relative;
+  padding-left: 1.3em;
+}
+
+[dir="rtl"] .has-pre-icon
+{
+  padding-right: 1.3em;
+  padding-left: auto;
+}
+
+.pre-icon
+{
+  display: inline-block;
+  position: absolute;
+  top: 50%;
+  left: 0;
+  width: 1em;
+  height: 1em;
+  margin-top: -0.55em;
+  background-repeat: no-repeat;
+  background-position: center;
+  background-size: 0.9em;
+}
+
+[dir="rtl"] .pre-icon
+{
+  right: 0;
+  left: auto;
+}