diff --git a/src/admin/announcement/detail.vue b/src/admin/announcement/detail.vue
index dfdf768..a585507 100644
--- a/src/admin/announcement/detail.vue
+++ b/src/admin/announcement/detail.vue
@@ -98,7 +98,7 @@ onMounted(init)
     v-model:value="announcement.content"
     :min-height="200"
   />
-  <n-flex justify="end">
+  <n-flex style="margin-bottom: 100px;" justify="end">
     <n-button type="primary" @click="submit">保存</n-button>
   </n-flex>
 </template>
diff --git a/src/admin/contest/detail.vue b/src/admin/contest/detail.vue
index d39076f..8dbc4c8 100644
--- a/src/admin/contest/detail.vue
+++ b/src/admin/contest/detail.vue
@@ -127,7 +127,7 @@ onMounted(getContestDetail)
     v-model:value="contest.description"
     :min-height="200"
   />
-  <n-flex justify="end">
+  <n-flex style="margin-bottom: 100px;" justify="end">
     <n-button type="primary" @click="submit">保存</n-button>
   </n-flex>
 </template>
diff --git a/src/admin/problem/detail.vue b/src/admin/problem/detail.vue
index 258e72a..5420972 100644
--- a/src/admin/problem/detail.vue
+++ b/src/admin/problem/detail.vue
@@ -511,7 +511,7 @@ watch(
       </n-flex>
     </template>
   </n-alert>
-  <n-space justify="space-between">
+  <n-space style="margin-bottom: 100px;" justify="space-between">
     <n-form inline label-placement="left" :show-feedback="false">
       <n-form-item label="语言">
         <n-checkbox-group v-model:value="problem.languages">
diff --git a/src/shared/components/Header.vue b/src/shared/components/Header.vue
index d57495d..14928e1 100644
--- a/src/shared/components/Header.vue
+++ b/src/shared/components/Header.vue
@@ -154,7 +154,7 @@ function goHome() {
       </n-button>
       <div v-if="userStore.isFinished">
         <n-dropdown v-if="userStore.isAuthed" :options="options" size="large">
-          <n-button @click="getRandomAvatar">
+          <n-button>
             <Icon :icon="avatar" height="20"></Icon>
             <span style="padding-left: 8px">
               {{ userStore.user!.username }}
diff --git a/src/shared/components/Login.vue b/src/shared/components/Login.vue
index 02eb2f8..d16320a 100644
--- a/src/shared/components/Login.vue
+++ b/src/shared/components/Login.vue
@@ -80,8 +80,9 @@ function goSignup() {
     <n-form ref="loginRef" :model="form" :rules="rules" show-require-mark>
       <n-alert :show-icon="false" class="tip">
         关于【选择班级】的提醒：<br />
-        如果是自己的号就选【不用填】 <br />
-        如果是上课统一生成的账号，但选项中没有你的班级，也选择【不用填】，但是用户名要写：ks班级+姓名，比如23计算机1班张三，就写ks231张三
+        1. 如果是上课统一生成的账号，选择【相应班级】，用户名直接写自己的名字 <br />
+        2. 同样是上课用的号，但是没有你的班级。选择【不用填】，用户名要写：ks班级+姓名，比如23计算机1班张三，就写ks231张三 <br />
+        3. 如果是自己注册的号，选择【不用填】 <br />
       </n-alert>
       <n-form-item label="选择班级" path="class" :show-require-mark="false">
         <n-select