My First Dart Web App

index.html

<div class="app">
  <h1 class="header">My Great Dart Web App</h1>
  <div class="button">DO THE THING</div>
  <div class="output"></div>
</div>

main.dart

import 'dart:html';

void main() {
  var counter = 0;
  doTheJob() {
    counter++;
    querySelector('.output').text = 'The Thing Is Done ${counter} Time(s)';
  }
  querySelector('.button').onClick.listen((e) => doTheJob());
}

styles.css

.app {
  height: 100vh;
  background-color: #ff8b8b;
  padding: 10px;
  color: white;
}
.header, .button, .output {
  text-align: center;
  font-family: 'Open Sans', sans-serif;
}
.button {
  font-size: 20px;
  margin: 20px auto 20px;
  padding: 10px;
  border-radius: 5px;
  cursor: pointer;
  background-color: #32b67a;
  width: 50%;
  box-shadow: 0px 8px 15px rgba(0, 0, 0, 0.1);
  user-select: none;
}