diff --git a/app/src/protyle/export/index.ts b/app/src/protyle/export/index.ts
index d4522c65b..a2e4b08bc 100644
--- a/app/src/protyle/export/index.ts
+++ b/app/src/protyle/export/index.ts
@@ -174,7 +174,7 @@ const renderPDF = async (id: string) => {
         #action {
           width: 232px;
           background: var(--b3-theme-surface);
-          padding: 16px 0;
+          padding: 12px 0;
           position: fixed;
           right: 0;
           top: 0;
@@ -219,13 +219,17 @@ const renderPDF = async (id: string) => {
           border-bottom: 1px solid var(--b3-theme-surface-lighter);
           display: block;
           color: var(--b3-theme-on-surface);
-          padding-bottom: 16px;
-          margin: 0 16px 16px 16px;
+          padding-bottom: 12px;
+          margin: 0 12px 12px 12px;
         }
         
         .b3-label:last-child {
             border-bottom: none;
         }
+        
+        #preview .render-node[data-subtype="plantuml"] object {
+            max-width: 100%;
+        }
         ${await setInlineStyle(false, servePath)}
         ${await getPluginStyle()}
     </style>
@@ -345,7 +349,7 @@ const renderPDF = async (id: string) => {
             <input id="paged" class="b3-switch" type="checkbox" ${localData.paged ? "checked" : ""}>
         </label>
     </div>
-    <div class="fn__flex" style="padding: 0 16px">
+    <div class="fn__flex" style="padding: 0 12px">
       <div class="fn__flex-1"></div>
       <button class="b3-button b3-button--cancel">${window.siyuan.languages.cancel}</button>
       <div class="fn__space"></div>