feat: better CSS structure

examples/web/react/app.css

 .app {
     color: #ffffff;
     font-family: VT323, Roboto, Open Sans, Arial, Helvetica, sans-serif;
-    margin: 0px 0px 0px 0px;
+    margin: 0px auto 0px auto;
+    max-width: 1400px;
 }
 
 .app h3 {

examples/web/react/components/registers-gb/registers-gb.css

@@ -20,13 +20,13 @@
 
 .registers-gb > .section > .register > .register-key {
     display: inline-block;
-    width: 40px;
     font-size: 20px;
+    width: 40px;
 }
 
 .registers-gb > .section > .register > .register-value {
     display: inline-block;
-    width: 66px;
-    text-align: right;
     font-size: 20px;
+    text-align: right;
+    width: 66px;
 }