diff --git a/theme/boost/scss/moodle.scss b/theme/boost/scss/moodle.scss
index ba84d8e71ff..a92eaa3eedb 100644
--- a/theme/boost/scss/moodle.scss
+++ b/theme/boost/scss/moodle.scss
@@ -39,3 +39,4 @@ $breadcrumb-divider-rtl: "◀" !default;
 @import "moodle/sticky-footer";
 @import "moodle/popover-region";
 @import "moodle/tool_usertours";
+@import "moodle/bs2-compat";
diff --git a/theme/boost/scss/moodle/bs2-compat.scss b/theme/boost/scss/moodle/bs2-compat.scss
new file mode 100644
index 00000000000..fa62ea83f00
--- /dev/null
+++ b/theme/boost/scss/moodle/bs2-compat.scss
@@ -0,0 +1,74 @@
+// Some - backwards compatibility for BS2. We may have plugins and user content targeted for BS2.
+
+// Well -> Panel -> Card. We skipped panel (BS3) so lets just support well and card.
+.well {
+    @extend .card;
+    @extend .card-block;
+}
+
+// Some things just got renamed.
+.img-responsive {
+    @extend .img-fluid;
+}
+
+.text-error {
+    @extend .text-danger;
+}
+
+.btn-default {
+    @extend .btn-secondary;
+}
+
+// Labels and badges.
+
+.label {
+    @extend .tag;
+    @include tag-variant($tag-default-bg);
+}
+
+.label-success {
+    @include tag-variant($tag-success-bg);
+}
+
+.label-info {
+    @include tag-variant($tag-info-bg);
+}
+
+.label-warning {
+    @include tag-variant($tag-warning-bg);
+}
+
+.label-important {
+    @include tag-variant($tag-danger-bg);
+}
+
+.badge {
+    @extend .tag;
+    @include tag-variant($tag-default-bg);
+    @include border-radius($font-size-root / 2);
+}
+
+.badge-success {
+    @include tag-variant($tag-success-bg);
+}
+
+.badge-info {
+    @include tag-variant($tag-info-bg);
+}
+
+.badge-warning {
+    @include tag-variant($tag-warning-bg);
+}
+
+.badge-important {
+    @include tag-variant($tag-danger-bg);
+}
+
+// Floats.
+.pull-left {
+    @include pull-left();
+}
+
+.pull-right {
+    @include pull-right();
+}