添加表格编辑功能

src/App.css

@@ -54,6 +54,7 @@ body {
 
 #preview {
   text-align: center;
+  min-height: 1024px;
 }
 
 .Power {
@@ -110,6 +111,37 @@ body {
   top: 20px;
 }
 
+.button {
+  background: #7892c2;
+  background-image: -webkit-linear-gradient(top, #7892c2, #476e9e);
+  background-image: -moz-linear-gradient(top, #7892c2, #476e9e);
+  background-image: -ms-linear-gradient(top, #7892c2, #476e9e);
+  background-image: -o-linear-gradient(top, #7892c2, #476e9e);
+  background-image: linear-gradient(to bottom, #7892c2, #476e9e);
+  text-shadow: 0px 1px 0px #283966;
+  -webkit-box-shadow: 0px 0px 0px 2px #9fb4f2;
+  -moz-box-shadow: 0px 0px 0px 2px #9fb4f2;
+  box-shadow: 0px 0px 0px 2px #9fb4f2;
+  font-family: Arial;
+  color: #ffffff;
+  font-size: 16px;
+  padding: 12px 30px 12px 30px;
+  border: solid #4e6096 1px;
+  text-decoration: none;
+}
+
+.button:hover {
+  color: #ffffff;
+  background: #476e9e;
+  text-decoration: none;
+}
+
+.buttonRightBottom {
+  position: fixed;
+  right: 10px;
+  bottom: 10px;
+}
+
 .object {
   width: 8px;
   height: 50px;