diff --git a/web/app/signup/steps/step1_profile.tsx b/web/app/signup/steps/step1_profile.tsx
index 06106073..19e2c0ef 100644
--- a/web/app/signup/steps/step1_profile.tsx
+++ b/web/app/signup/steps/step1_profile.tsx
@@ -129,7 +129,7 @@ export default function Step1({ onSave, prev, caller }: StepProps<Step1User>) {
               error={errors?.intro}
             >
               <textarea
-                className="textarea textarea-bordered w-full"
+                className="textarea textarea-bordered w-full text-base"
                 rows={5}
                 placeholder="こんにちは！仲良くしてください！"
                 {...register("intro")}