Update index.css

frontend/src/index.css

@@ -1,10 +1,17 @@
+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+
 body {
   margin: 0;
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
-    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
-    sans-serif;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
+  font-family: 'Open-Sans',sans-serif;
+  color: #343a4a;
+  display: flex;
+  justify-content: center;
+  min-height: 100vh;
+  padding: 80px;
 }
 
 code {