diff --git a/app/src/protyle/toolbar/index.ts b/app/src/protyle/toolbar/index.ts
index ff3feed9d..f25baa908 100644
--- a/app/src/protyle/toolbar/index.ts
+++ b/app/src/protyle/toolbar/index.ts
@@ -683,7 +683,7 @@ export class Toolbar {
     <span class="fn__space"></span>
     <button data-type="close" class="block__icon b3-tooltips b3-tooltips__nw" aria-label="${window.siyuan.languages.close}"><svg style="width: 10px"><use xlink:href="#iconClose"></use></svg></button>
 </div>
-<textarea spellcheck="false" class="b3-text-field b3-text-field--text fn__block" placeholder="${placeholder}" style="width:${isMobile() ? "80vw" : Math.max(480, renderElement.clientWidth * 0.7) + "px"};max-height:50vh"></textarea></div>`;
+<textarea spellcheck="false" class="b3-text-field b3-text-field--text fn__block" placeholder="${placeholder}" style="width:${isMobile() ? "100vw" : Math.max(480, renderElement.clientWidth * 0.7) + "px"};max-height:50vh"></textarea></div>`;
         const autoHeight = () => {
             textElement.style.height = textElement.scrollHeight + "px";
             if (isMobile()) {