diff --git a/web_src/css/base.css b/web_src/css/base.css
index 760c519e5..1d1846bae 100644
--- a/web_src/css/base.css
+++ b/web_src/css/base.css
@@ -363,6 +363,10 @@ ol.ui.list li,
   border-right-color: var(--color-primary);
 }
 
+.ui.menu {
+  display: flex;
+}
+
 .ui.menu,
 .ui.vertical.menu {
   background: var(--color-menu);
@@ -749,37 +753,6 @@ img.ui.avatar,
   padding-top: 14px;
 }
 
-/* overwrite semantic width of containers inside the main page content div (div with class "page-content") */
-.page-content .ui.ui.ui.container:not(.fluid) {
-  width: 1280px;
-  max-width: calc(100% - 64px);
-  margin-left: auto;
-  margin-right: auto;
-}
-
-.ui.container.fluid.padded {
-  padding: 0 32px;
-}
-
-/* enable fluid page widths for medium size viewports */
-@media (min-width: 768px) and (max-width: 1200px) {
-  .page-content .ui.ui.ui.container:not(.fluid) {
-    max-width: calc(100% - 32px);
-  }
-  .ui.container.fluid.padded {
-    padding: 0 16px;
-  }
-}
-
-@media (max-width: 767.98px) {
-  .page-content .ui.ui.ui.container:not(.fluid) {
-    max-width: calc(100% - 16px);
-  }
-  .ui.container.fluid.padded {
-    padding: 0 8px;
-  }
-}
-
 .ui.pagination.menu .active.item {
   color: var(--color-text);
   background: var(--color-active);
diff --git a/web_src/css/index.css b/web_src/css/index.css
index e8df32182..7ba19e62d 100644
--- a/web_src/css/index.css
+++ b/web_src/css/index.css
@@ -14,6 +14,7 @@
 @import "./modules/svg.css";
 @import "./modules/flexcontainer.css";
 @import "./modules/message.css";
+@import "./modules/container.css";
 @import "./modules/header.css";
 
 @import "./shared/flex-list.css";
diff --git a/web_src/css/modules/container.css b/web_src/css/modules/container.css
new file mode 100644
index 000000000..dc854f89d
--- /dev/null
+++ b/web_src/css/modules/container.css
@@ -0,0 +1,78 @@
+/* based on Fomantic UI container module, with just the parts extracted that we use. If you find any
+   unused rules here after refactoring, please remove them. */
+
+.ui.container {
+  display: block;
+  max-width: 100%;
+}
+
+@media (max-width: 767.98px) {
+  .ui.ui.ui.container:not(.fluid) {
+    width: auto;
+    margin-left: 1em;
+    margin-right: 1em;
+  }
+}
+
+@media (min-width: 768px) and (max-width: 991.98px) {
+  .ui.ui.ui.container:not(.fluid) {
+    width: 723px;
+    margin-left: auto;
+    margin-right: auto;
+  }
+}
+
+@media (min-width: 992px) and (max-width: 1199.98px) {
+  .ui.ui.ui.container:not(.fluid) {
+    width: 933px;
+    margin-left: auto;
+    margin-right: auto;
+  }
+}
+
+@media (min-width: 1200px) {
+  .ui.ui.ui.container:not(.fluid) {
+    width: 1127px;
+    margin-left: auto;
+    margin-right: auto;
+  }
+}
+
+.ui.fluid.container {
+  width: 100%;
+}
+
+.ui[class*="center aligned"].container {
+  text-align: center;
+}
+
+/* overwrite width of containers inside the main page content div (div with class "page-content") */
+.page-content .ui.ui.ui.container:not(.fluid) {
+  width: 1280px;
+  max-width: calc(100% - 64px);
+  margin-left: auto;
+  margin-right: auto;
+}
+
+.ui.container.fluid.padded {
+  padding: 0 32px;
+}
+
+/* enable fluid page widths for medium size viewports */
+@media (min-width: 768px) and (max-width: 1200px) {
+  .page-content .ui.ui.ui.container:not(.fluid) {
+    max-width: calc(100% - 32px);
+  }
+  .ui.container.fluid.padded {
+    padding: 0 16px;
+  }
+}
+
+@media (max-width: 767.98px) {
+  .page-content .ui.ui.ui.container:not(.fluid) {
+    max-width: calc(100% - 16px);
+  }
+  .ui.container.fluid.padded {
+    padding: 0 8px;
+  }
+}
diff --git a/web_src/fomantic/build/semantic.css b/web_src/fomantic/build/semantic.css
index 4d8224427..d9abf343b 100644
--- a/web_src/fomantic/build/semantic.css
+++ b/web_src/fomantic/build/semantic.css
@@ -3032,163 +3032,6 @@
 .plus:before { content: '\e802'; }
 */
 
-/*******************************
-         Site Overrides
-*******************************/
-/*!
- * # Fomantic-UI - Container
- * http://github.com/fomantic/Fomantic-UI/
- *
- *
- * Released under the MIT license
- * http://opensource.org/licenses/MIT
- *
- */
-
-/*******************************
-            Container
-*******************************/
-
-/* All Sizes */
-
-.ui.container {
-  display: block;
-  max-width: 100%;
-}
-
-/* Mobile */
-
-@media only screen and (max-width: 767.98px) {
-  .ui.ui.ui.container:not(.fluid) {
-    width: auto;
-    margin-left: 1em;
-    margin-right: 1em;
-  }
-
-  .ui.ui.ui.grid.container {
-    width: auto;
-  }
-
-  .ui.ui.ui.relaxed.grid.container {
-    width: auto;
-  }
-
-  .ui.ui.ui.very.relaxed.grid.container {
-    width: auto;
-  }
-}
-
-/* Tablet */
-
-@media only screen and (min-width: 768px) and (max-width: 991.98px) {
-  .ui.ui.ui.container:not(.fluid) {
-    width: 723px;
-    margin-left: auto;
-    margin-right: auto;
-  }
-
-  .ui.ui.ui.grid.container {
-    width: calc(723px + 2rem);
-  }
-
-  .ui.ui.ui.relaxed.grid.container {
-    width: calc(723px + 3rem);
-  }
-
-  .ui.ui.ui.very.relaxed.grid.container {
-    width: calc(723px + 5rem);
-  }
-}
-
-/* Small Monitor */
-
-@media only screen and (min-width: 992px) and (max-width: 1199.98px) {
-  .ui.ui.ui.container:not(.fluid) {
-    width: 933px;
-    margin-left: auto;
-    margin-right: auto;
-  }
-
-  .ui.ui.ui.grid.container {
-    width: calc(933px + 2rem);
-  }
-
-  .ui.ui.ui.relaxed.grid.container {
-    width: calc(933px + 3rem);
-  }
-
-  .ui.ui.ui.very.relaxed.grid.container {
-    width: calc(933px + 5rem);
-  }
-}
-
-/* Large Monitor */
-
-@media only screen and (min-width: 1200px) {
-  .ui.ui.ui.container:not(.fluid) {
-    width: 1127px;
-    margin-left: auto;
-    margin-right: auto;
-  }
-
-  .ui.ui.ui.grid.container {
-    width: calc(1127px + 2rem);
-  }
-
-  .ui.ui.ui.relaxed.grid.container {
-    width: calc(1127px + 3rem);
-  }
-
-  .ui.ui.ui.very.relaxed.grid.container {
-    width: calc(1127px + 5rem);
-  }
-}
-
-/*******************************
-             Types
-*******************************/
-
-/* Text Container */
-
-.ui.text.container {
-  font-family: var(--fonts-regular);
-  max-width: 700px;
-  line-height: 1.5;
-  font-size: 1.14285714rem;
-}
-
-/* Fluid */
-
-.ui.fluid.container {
-  width: 100%;
-}
-
-/*******************************
-           Variations
-*******************************/
-
-.ui[class*="left aligned"].container {
-  text-align: left;
-}
-
-.ui[class*="center aligned"].container {
-  text-align: center;
-}
-
-.ui[class*="right aligned"].container {
-  text-align: right;
-}
-
-.ui.justified.container {
-  text-align: justify;
-  -webkit-hyphens: auto;
-  hyphens: auto;
-}
-
-/*******************************
-         Theme Overrides
-*******************************/
-
 /*******************************
          Site Overrides
 *******************************/
diff --git a/web_src/fomantic/semantic.json b/web_src/fomantic/semantic.json
index 876996a4b..9c7cb54cb 100644
--- a/web_src/fomantic/semantic.json
+++ b/web_src/fomantic/semantic.json
@@ -24,7 +24,6 @@
     "api",
     "button",
     "checkbox",
-    "container",
     "dimmer",
     "dropdown",
     "form",