diff --git a/build.gradle b/build.gradle
index 98ab1b6..f002612 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@ plugins {
 }
 
 group = 'de.jottyfan.camporganizer'
-version = '0.5.6'
+version = '0.5.7'
 
 description = """CampOrganizer2"""
 
diff --git a/src/main/java/de/jottyfan/camporganizer/module/registration/RegistrationRepository.java b/src/main/java/de/jottyfan/camporganizer/module/registration/RegistrationRepository.java
index dad1224..c78b1cc 100644
--- a/src/main/java/de/jottyfan/camporganizer/module/registration/RegistrationRepository.java
+++ b/src/main/java/de/jottyfan/camporganizer/module/registration/RegistrationRepository.java
@@ -94,7 +94,7 @@ public class RegistrationRepository {
 		SelectConditionStep<TProfileRecord> sql = jooq
 		// @formatter:off
 			.selectFrom(T_PROFILE)
-			.where(T_PROFILE.USERNAME.eq(login));
+			.where(DSL.lower(T_PROFILE.USERNAME).eq(login));
 		// @formatter:on
 		LOGGER.debug(sql);
 		return sql.fetch().size() < 1;
@@ -111,9 +111,9 @@ public class RegistrationRepository {
 		LambdaResultWrapper lrw = new LambdaResultWrapper();
 		jooq.transaction(t -> {
 			if (bean.getLogin() != null && !bean.getLogin().isEmpty()) {
-				Boolean loginNotYetInUse = isLoginNotYetInUse(bean.getLogin());
+				Boolean loginNotYetInUse = isLoginNotYetInUse(bean.getLogin().toLowerCase());
 				if (bean.getRegisterInKeycloak() && !loginNotYetInUse) {
-					throw new DataAccessException("login already in use: " + bean.getLogin());
+					throw new DataAccessException("login already in use: " + bean.getLogin().toLowerCase());
 				}
 				Integer fkProfile = null;
 				if (loginNotYetInUse) {
@@ -127,7 +127,7 @@ public class RegistrationRepository {
 								        T_PROFILE.PASSWORD,
 								        T_PROFILE.DUEDATE,
 								        T_PROFILE.UUID)
-						.values(bean.getForename(), bean.getSurname(), bean.getLogin(), oldPassword, LocalDateTime.now().plus(356, ChronoUnit.DAYS), UUID.nameUUIDFromBytes(bean.getLogin().getBytes()).toString())
+						.values(bean.getForename(), bean.getSurname(), bean.getLogin().toLowerCase(), oldPassword, LocalDateTime.now().plus(356, ChronoUnit.DAYS), UUID.nameUUIDFromBytes(bean.getLogin().getBytes()).toString())
 						.returning(T_PROFILE.PK);
 					// @formatter:on
 					LOGGER.debug(sql1.toString());
@@ -147,7 +147,7 @@ public class RegistrationRepository {
 					// @formatter:off
 						.select(T_PROFILE.PK)
 						.from(T_PROFILE)
-						.where(T_PROFILE.USERNAME.eq(bean.getLogin()));
+						.where(DSL.lower(T_PROFILE.USERNAME).eq(bean.getLogin().toLowerCase()));
 					// @formatter:on
 					LOGGER.debug(sql1.toString());
 					fkProfile = sql1.fetchOne().get(T_PROFILE.PK);
diff --git a/src/main/resources/static/css/style.css b/src/main/resources/static/css/style.css
index 5662087..173638a 100644
--- a/src/main/resources/static/css/style.css
+++ b/src/main/resources/static/css/style.css
@@ -437,3 +437,8 @@ div {
 .beforetext {
 	margin-right: 8px;
 }
+
+.visibledropdown {
+	max-height: 80vh;
+	overflow: auto;
+}
diff --git a/src/main/resources/templates/template.html b/src/main/resources/templates/template.html
index bede989..34b01f4 100644
--- a/src/main/resources/templates/template.html
+++ b/src/main/resources/templates/template.html
@@ -38,7 +38,7 @@
 				<li class="nav-item"><a class="btn btn-icon-silent menufont" th:href="@{/verein}">Verein</a></li>
 				<li class="nav-item dropdown"><a class="nav-link dropdown-toggle btn-icon-silent menufont" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
 						Tagebuch </a>
-					<ul class="dropdown-menu" aria-labelledby="navbarDropdown">
+					<ul class="dropdown-menu visibledropdown" aria-labelledby="navbarDropdown">
 						<li><a class="dropdown-item menufont" th:href="@{/reports/olfenostern2023}">Osterfreizeit 2023 in Olfen</a></li>
 						<li><hr class="dropdown-divider"></li>
 						<li><a class="dropdown-item menufont" th:href="@{/reports/olfen2020}">Herbstfreizeit 2020 in Olfen</a></li>