修改欢迎页结构

css/global.css

@@ -93,6 +93,10 @@ body{
 .software-down{
   padding: 50px 0;
 }
+.images-usb{
+  width:100%;
+  text-align: center;
+}
 .lock-detail{
   width:100%;
 }

softwrae-welcome2.html

@@ -152,15 +152,15 @@
         </div>
       </div>
       <div class="software-wrap">
-        <div class="software-down" style="height:595px;">
-          <div class="row" style="margin-top:80px;">
+        <div class="software-down" style="margin:50px 0 50px;">
+          <div class="row">
             <div class="col"></div>
             <div class="col">
-              <a href="software-list.html" class="btn btn-orange btn-block">开始使用</a>
-              <div class="mt-3"><img src="images/usb.png"></div>
+              <a href="software-list.html" class="btn btn-orange btn-block btn-lg">开始使用</a>
             </div>
             <div class="col"></div>
           </div>
+          <div class="images-usb mt-5"><img src="images/usb.png"></div>
         </div>
       </div>
   	</div>