[update]

季節ごとの線を修正

css/kitagata_creature_encyclopedia.css

     width: 100%;
 }
 
-.seasonalCreatures_title {
-    margin-bottom: 16px;
-}
-
-.seasonalCreatures_title::before {
+.seasonalCreaturesTitleBar {
     content: '';
     width: 94%;
     height: 4px;
     display: inline-block;
-    background-color: gray;
+    background-color: #F0F0F0;
     position: absolute;
     top: 148px;
 }
 
+.seasonalCreaturesTitleBar::after {
+    content: '';
+    width: 20px;
+    height: 20px;
+    border-radius: 50%;
+    display: inline-block;
+    background-color: #F0F0F0;
+    position: absolute;
+    top: -8px;
+    right: -4px;
+}
+
+.seasonalCreatures_title {
+    margin-bottom: 16px;
+}
+
 .seasonalCreatures_titleText {
     font-size: 24px;
     font-weight: bold;

second/kitagata_creature_encyclopedia.html

             <p>生き物の詳細ページに飛ぶよ！</p>
           </div>
 
+          <div class="seasonalCreaturesTitleBar"></div>
           <div class="seasonalCreatures_block">
             <div class="seasonalCreatures_title">
               <span class="seasonalCreatures_titleText">春の生き物</span>