diff --git a/web/template/syzoj/problem.php b/web/template/syzoj/problem.php
index f3bca09..b8dc305 100644
--- a/web/template/syzoj/problem.php
+++ b/web/template/syzoj/problem.php
@@ -121,9 +121,9 @@ if ($pr_flag) {
     <?php
     function trans_md($str)
     {
-      return bbcode_to_html("<span class='md'>" + bbcode_to_html(
+      return bbcode_to_html("<span class='md'>" .
         htmlentities($str, ENT_QUOTES, 'UTF-8')
-      ) + "</span>");
+        . "</span>");
     }
     ?>
     <div class="row">
@@ -141,9 +141,9 @@ if ($pr_flag) {
         <div class="column">
           <h4 class="ui top attached block header"><?php echo $MSG_Input ?></h4>
           <div id='input' class="ui bottom attached segment font-content">
-          <?php
-          echo trans_md($row['input']);
-          ?>   
+            <?php
+            echo trans_md($row['input']);
+            ?>
           </div>
         </div>
       </div>
@@ -153,9 +153,9 @@ if ($pr_flag) {
         <div class="column">
           <h4 class="ui top attached block header"><?php echo $MSG_Output ?></h4>
           <div id='output' class="ui bottom attached segment font-content">
-          <?php
-          echo trans_md($row['output']);
-          ?> 
+            <?php
+            echo trans_md($row['output']);
+            ?>
           </div>
         </div>
       </div>
@@ -205,9 +205,9 @@ if ($pr_flag) {
         <div class="column">
           <h4 class="ui top attached block header"><?php echo $MSG_HINT ?></h4>
           <div id='hint' class="ui bottom attached segment font-content hint">
-          <?php
-          echo trans_md($row['hint']);
-          ?> 
+            <?php
+            echo trans_md($row['hint']);
+            ?>
           </div>
         </div>
       </div>