diff --git a/index.html b/index.html
index a3843d9..b7c6f6c 100644
--- a/index.html
+++ b/index.html
@@ -34,11 +34,11 @@
 	</div>
 
 	<div id="tab-c-apdu" class="tab-content">
-		<div class="flex gap-1 mb-2">
-			<button class="c-apdu-subtab px-3 py-1 text-xs rounded-full bg-blue-600 text-white" data-sub="sim" onclick="cApduSwitchSubtab('sim')">SIM</button>
-			<button class="c-apdu-subtab px-3 py-1 text-xs rounded-full bg-gray-200 dark:bg-slate-700 text-gray-700 dark:text-slate-300 hover:bg-gray-300 dark:hover:bg-slate-600" data-sub="usim" onclick="cApduSwitchSubtab('usim')">USIM</button>
-			<button class="c-apdu-subtab px-3 py-1 text-xs rounded-full bg-gray-200 dark:bg-slate-700 text-gray-700 dark:text-slate-300 hover:bg-gray-300 dark:hover:bg-slate-600" data-sub="ber" onclick="cApduSwitchSubtab('ber')">BER-TLV</button>
-			<button class="c-apdu-subtab px-3 py-1 text-xs rounded-full bg-gray-200 dark:bg-slate-700 text-gray-700 dark:text-slate-300 hover:bg-gray-300 dark:hover:bg-slate-600" data-sub="ram" onclick="cApduSwitchSubtab('ram')">RAM</button>
+		<div class="flex justify-center gap-2 mb-3">
+			<button class="c-apdu-subtab px-4 py-1.5 text-sm rounded-full bg-blue-600 text-white" data-sub="sim" onclick="cApduSwitchSubtab('sim')">SIM</button>
+			<button class="c-apdu-subtab px-4 py-1.5 text-sm rounded-full bg-gray-200 dark:bg-slate-700 text-gray-700 dark:text-slate-300 hover:bg-gray-300 dark:hover:bg-slate-600" data-sub="usim" onclick="cApduSwitchSubtab('usim')">USIM</button>
+			<button class="c-apdu-subtab px-4 py-1.5 text-sm rounded-full bg-gray-200 dark:bg-slate-700 text-gray-700 dark:text-slate-300 hover:bg-gray-300 dark:hover:bg-slate-600" data-sub="ber" onclick="cApduSwitchSubtab('ber')">BER-TLV</button>
+			<button class="c-apdu-subtab px-4 py-1.5 text-sm rounded-full bg-gray-200 dark:bg-slate-700 text-gray-700 dark:text-slate-300 hover:bg-gray-300 dark:hover:bg-slate-600" data-sub="ram" onclick="cApduSwitchSubtab('ram')">RAM</button>
 		</div>
 		<div id="c-apdu-sub-sim">
 		<div class="flex gap-4 mb-3">