diff --git a/public/index.html b/public/index.html
index b52d50e..1216645 100644
--- a/public/index.html
+++ b/public/index.html
@@ -22,11 +22,11 @@
                 font-weight: 600;
             }
             @media (max-width: 512px) {
-                .big-text {
+                #big-text {
                     font-size: 48pt;
                 }
-                .welcome-text {
-                    font-size: 6pt;
+                #welcome-text {
+                    font-size: 8pt;
                 }
             }
         </style>
@@ -34,7 +34,7 @@
 {% block content %}
             <div class="inner">
                 <div class="flex-vertical">
-                    <p id="big-text" class="text-white big-text" style="padding-bottom: 0px; margin-bottom: 0px; text-box: trim-both cap alphabetic;">NERCONE</p>
+                    <p id="big-text" class="text-white" style="padding-bottom: 0px; margin-bottom: 0px; text-box: trim-both cap alphabetic;">NERCONE</p>
                     <p id="welcome-text" class="font-bold" style="padding-top: 0px; margin-top: 0px; text-box: trim-both cap alphabetic;">ようこそ・Welcome・<span class="font-nsasc">欢迎</span>・<span class="font-nsatc">歡迎</span>・<span class="font-nsakr">환영해요</span></p>
                 </div>
             </div>