Merge pull request #943 from dalf/fix-874

[simple] switch to tablet layout when the screen width is stictly below 1280px

searx/static/themes/simple/src/less/definitions.less

@@ -244,7 +244,7 @@
 
 /// Device Size
 /// @desktop > @tablet
-@tablet: 80em;
+@tablet: 79.75em;  // see https://github.com/searxng/searxng/issues/874
 @phone: 50em;
 @small-phone: 35em;
 @ultra-small-phone: 20rem;