UI 排版

让我们首先排版布局一下 pomodoro 应用的基础组成元素。

打开 App.js，删除其中内容，并修改如下：

import "./App.css";

function App() {
  return (
    <div className="app">
      <h1 className="app-name">
        Literank
        <br />
        Pomodoro
      </h1>
      <div className="segments">
        <span className="segment left-seg picked">Pomodoro</span>
        <span className="segment right-seg">Break</span>
      </div>
      <div className="card">
        <h1 className="timer">25:00</h1>
        <button className="control-btn">Start</button>
      </div>
      <div className="settings">
        <span className="setting-btn">Settings</span>
      </div>
    </div>
  );
}

export default App;

打开 App.css，删除其中内容，并修改如下：

body {
  background-color: #F28585;
  font-family: Geneva, Verdana, Tahoma, sans-serif;
}

.app {
  margin: 15vh auto;
  width: 24rem;
  text-align: center;
  color: white;
}

.app-name {
  text-align: left;
}

.segments {
  margin-top: 2rem;
}

.segment {
  background-color: rgba(255, 255, 255, 0.1);
  padding: 5px 12px;
  cursor: pointer;
}

.left-seg {
  border-top-left-radius: 0.5rem;
  border-bottom-left-radius: 0.5rem;
}

.right-seg {
  border-top-right-radius: 0.5rem;
  border-bottom-right-radius: 0.5rem;
}

.settings {
  display: flex;
  justify-content: flex-end;
}

.setting-btn {
  padding: 5px 12px;
  background-color: rgba(255, 255, 255, 0.1);
  cursor: pointer;
  border-radius: 0.5rem;
}

.picked {
  background-color: coral;
}

.card {
  box-sizing: border-box;
  background-color: rgba(255, 255, 255, 0.15);
  padding: 1rem;
  margin: 1rem 0;
  border-radius: 0.5rem;
}

.timer {
  font-size: 100px;
  margin-top: 2rem;
  margin-bottom: 2rem;
  font-family: monospace, 'Courier New', Courier;
}

.control-btn {
  padding: 6px 25px;
  font-size: 36px;
  background-color: white;
  border: none;
  border-bottom: solid 5px lightcoral;
  border-radius: 0.5rem;
  cursor: pointer;
  color: #F28585;
}

开发服务器会自动刷新页面，此刻可以看到如下界面：