Improve logo sizing on small screens

invenio_theme_tuw/assets/semantic-ui/less/invenio_theme_tuw/theme.less

@@ -357,4 +357,14 @@ button.ui.icon.search.button {
 
 .textlogo img {
   width:100px;
-}
+}
\ No newline at end of file
+
+.ui.container.grid > * {
+  flex: auto;
+}
+
+#logos .ui.container.grid > * {
+  flex: 0 0 auto;
+  min-width: fit-content;
+  min-width: -moz-fit-content;
+}