fix(compiler): fixed

src/pages/Welcome.less

@@ -7,7 +7,7 @@
     padding: 40px 0 30px 30px;
     overflow: hidden;
     color: #fff;
-    background: url('../../public/assets/book-bg.png');
+    background: url('../../public/assets/book-bg.jpg');
     background-size: cover;
     border-radius: 20px;
     .leftTitle {