SOURCE

<div class="container">
  <div class="form-row">
    <label for="user_name">邮箱</label>
    <input type="text" name="user_name"/>    
  </div>
  <div class="form-row">
    <label for="user_password">密码</label>
    <input type="text" name="user_password"/>    
  </div>
  <div class="form-row" style="margin-top: 20px;">
    <button class="btn-primary">登录</button>
  </div>
</div>

body {
  background-color: #f1f1f1;
}

.container {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  width: 200px;
  height: 130px;
  margin: auto;
  padding: 20px;
  border: 1px solid #f1f1f1;
  border-radius: 8px;
  background-color: white;
}

.form-row > label {
  display: inline-block;
  width: 60px;
  height: 40px;
}

.form-row > input {
  width: 130px;
}

.btn-primary {
  font-size: 16px;
  line-height: 24px;
  width: 200px;
  border: 0;
  border-radius: 12px;
  background-color: #187cb7;
  color: white;
  cursor: pointer;
}