Fix submission list UI

Author: adrien1018

app/views/submissions/index.html.erb

@@ -43,7 +43,7 @@
     <input id="filter_username" name="filter_username" class="form-control input-sm flat" type="text" placeholder="Enter Username">
   </div>
   <div class="form-group">
-    <input id="filter_problem" name="filter_problem" class="form-control input-sm flat" type="number" min="<%= Problem.order(id: :asc).first&.id %>" max="<%= Problem.order(id: :desc).first&.id %>" placeholder="Enter Problem ID">
+    <input id="filter_problem" name="filter_problem" class="form-control input-sm flat" style="width:150px;" type="number" min="<%= Problem.order(id: :asc).first&.id %>" max="<%= Problem.order(id: :desc).first&.id %>" placeholder="Enter Problem ID">
   </div>
   <div class="form-group">
     <select id="filter_status" name="filter_status[]" class="selectpicker" multiple title="Select Result">
@@ -58,7 +58,7 @@
     </select>
   </div>
   <div class="form-group">
-    <select id="filter_compiler" name="filter_compiler[]" class="selectpicker" multiple="multiple" title="Select Compiler">
+    <select id="filter_compiler" name="filter_compiler[]" class="selectpicker" multiple title="Select Compiler">
       <% Compiler.order(order: :asc).all.each do |x| %>
         <option value="<%= x.id %>"><%= x.name %></option>
       <% end %>