diff --git a/web/template/syzoj/problem.php b/web/template/syzoj/problem.php
index 644bbd1..6f0752e 100644
--- a/web/template/syzoj/problem.php
+++ b/web/template/syzoj/problem.php
@@ -123,12 +123,14 @@ if ($pr_flag) {
       <div class="column">
         <h4 class="ui top attached block header"><?php echo $MSG_Description ?></h4>
         <div id="description" class="ui bottom attached segment font-content">
-          <pre class='md auto_select'>
+          <span class='md auto_select'>
             <?php
-            echo bbcode_to_html($row['description']);
+            echo bbcode_to_html(
+              htmlentities ($row['description'], ENT_QUOTES, 'UTF-8')
+            );
             ?>
 
-          </pre>
+          </span>
         </div>
       </div>
     </div>
@@ -137,14 +139,14 @@ 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">
-            <pre class='md auto_select'>
+            <span class='md auto_select'>
               <?php echo
                 bbcode_to_html(
-                  $row['input']
+                  htmlentities ($row['input'], ENT_QUOTES, 'UTF-8')
                 );
               ?>
 
-            </pre>
+            </span>
           </div>
         </div>
       </div>
@@ -154,14 +156,14 @@ 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">
-            <pre class='md auto_select'>
-              <?php echo
+            <span class='md auto_select'>
+              <?php echo 
                 bbcode_to_html(
-                  $row['output']
+                  htmlentities ($row['output'], ENT_QUOTES, 'UTF-8')
                 );
               ?>
 
-            </pre>
+            </span>
           </div>
         </div>
       </div>
@@ -211,14 +213,14 @@ 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">
-            <pre class='md auto_select'>
+            <span class='md auto_select'>
               <?php echo
                 bbcode_to_html(
-                  $row['hint']
+                  htmlentities ($row['hint'], ENT_QUOTES, 'UTF-8')
                 );
               ?>
 
-            </pre>
+            </span>
           </div>
         </div>
       </div>