feat: set only <li> in the <ul>

src/components/TimeStepSelector/TimeStepSelector.tsx

@@ -105,7 +105,7 @@ const TimeStepSelector: React.FC<TimeStepSelectorProps> = ({
                     {t(`timestep.${TimeStep[step].toLowerCase()}.period`)}
                   </span>
                 </li>
-                <span className="bar"></span>
+                <li className="bar"></li>
               </React.Fragment>
             )
           })}