fix: [css] Added login css/image

app/webroot/css/login.css

@@ -0,0 +1,28 @@
+/* based on the example from https://getbootstrap.com/docs/4.0/examples/sign-in/*/
+.form-signin {
+    width: 100%;
+    max-width: 330px;
+    padding: 15px;
+    margin: 0 auto;
+}
+
+.form-signin .form-control {
+  position: relative;
+  box-sizing: border-box;
+  height: auto;
+  padding: 10px;
+  font-size: 16px;
+}
+.form-signin .form-control:focus {
+  z-index: 2;
+}
+.form-signin input[type="email"] {
+  margin-bottom: -1px;
+  border-bottom-right-radius: 0;
+  border-bottom-left-radius: 0;
+}
+.form-signin input[type="password"] {
+  margin-bottom: 10px;
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}