diff --git a/searx/static/themes/simple/css/searxng-rtl.min.css b/searx/static/themes/simple/css/searxng-rtl.min.css
index af5c65ff3..1fe336369 100644
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diff --git a/searx/static/themes/simple/css/searxng-rtl.min.css.map b/searx/static/themes/simple/css/searxng-rtl.min.css.map
index 18040a875..295090782 100644
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diff --git a/searx/static/themes/simple/css/searxng.min.css b/searx/static/themes/simple/css/searxng.min.css
index 8bd106ccf..270504771 100644
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diff --git a/searx/static/themes/simple/css/searxng.min.css.map b/searx/static/themes/simple/css/searxng.min.css.map
index 11af270e6..a4892dfb4 100644
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diff --git a/searx/static/themes/simple/src/less/mixins.less b/searx/static/themes/simple/src/less/mixins.less
index 75c6703a1..7d8082f5a 100644
--- a/searx/static/themes/simple/src/less/mixins.less
+++ b/searx/static/themes/simple/src/less/mixins.less
@@ -1,6 +1,4 @@
-/*
-* SearXNG, A privacy-respecting, hackable metasearch engine
-*/
+// SPDX-License-Identifier: AGPL-3.0-or-later
 
 // Mixins
 .text-size-adjust (@property: 100%) {
@@ -25,44 +23,5 @@
 // disable user selection
 .disable-user-select () {
   -webkit-touch-callout: none;
-  -webkit-user-select: none;
-  -khtml-user-select: none;
-  -moz-user-select: none;
-  -ms-user-select: none;
   user-select: none;
 }
-
-// select all on focus
-.select-all-on-focus() {
-  -webkit-user-select: all;
-  -moz-user-select: all;
-  -ms-user-select: element;
-  user-select: all;
-}
-
-// see https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Advanced_layouts_with_flexbox
-.flexbox() {
-  display: -webkit-box;
-  display: -moz-box;
-  display: -webkit-flex;
-  display: -ms-flexbox;
-  display: flex;
-}
-
-.inline-flex() {
-  display: -webkit-inline-box;
-  display: -moz-inline-box;
-  display: -webkit-inline-flex;
-  display: -ms-inline-flexbox;
-  display: inline-flex;
-}
-
-.flex-direction-row() {
-  -webkit-box-direction: normal;
-  -webkit-box-orient: horizontal;
-  -moz-box-direction: normal;
-  -moz-box-orient: horizontal;
-  -webkit-flex-direction: row;
-  -ms-flex-direction: row;
-  flex-direction: row;
-}
diff --git a/searx/static/themes/simple/src/less/search.less b/searx/static/themes/simple/src/less/search.less
index 0cca1f521..675f26f2f 100644
--- a/searx/static/themes/simple/src/less/search.less
+++ b/searx/static/themes/simple/src/less/search.less
@@ -194,9 +194,6 @@
     #main_index,
     #main_results {
       #categories_container {
-        width: 1000px;
-        width: -moz-max-content;
-        width: -webkit-max-content;
         width: max-content;
 
         .category {
diff --git a/searx/static/themes/simple/src/less/toolkit.less b/searx/static/themes/simple/src/less/toolkit.less
index 924c81a08..76db36853 100644
--- a/searx/static/themes/simple/src/less/toolkit.less
+++ b/searx/static/themes/simple/src/less/toolkit.less
@@ -99,7 +99,7 @@ tr {
   font-size: 0.8em;
   word-break: break-all;
   margin: 0.1em;
-  .select-all-on-focus();
+  user-select: all;
 }
 
 div.selectable_url {
@@ -218,8 +218,7 @@ div.selectable_url {
 }
 
 .tabs {
-  .flexbox();
-
+  display: flex;
   flex-wrap: wrap;
   width: 100%;
   min-width: 100%;