Change antd primary-color.

web/src/App.less

@@ -0,0 +1,41 @@
+@import '~antd/dist/antd.less';
+
+.App {
+  text-align: center;
+}
+
+.App-logo {
+  height: 40vmin;
+  pointer-events: none;
+}
+
+.App-header {
+  background-color: #282c34;
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  font-size: calc(10px + 2vmin);
+  color: white;
+}
+
+.App-link {
+  color: #61dafb;
+}
+
+#parent-area {
+  position: relative;
+  min-height: 100vh;
+}
+
+#content-wrap {
+  padding-bottom: 70px;    /* Footer height */
+}
+
+#footer {
+  position: absolute;
+  bottom: 0;
+  width: 100%;
+  height: 70px;            /* Footer height */
+}