*{
  /* 初始化 取消页面元素的内外边距 */
  margin: 0;
  padding: 0;
}
body{
  /* 100%窗口高度 */
  height: 100vh;
  /* 弹性布局 水平、垂直居中 */
  display: flex;
  justify-content: center;
  align-items: center;
  /* 渐变背景 
  background: linear-gradient(200deg,#00c6fb,#66a6ff);
  */
}

.hide {
    display: none !important;
  }
  
  #game {
    height: 600px;
    width: 420px;
    background: #fff;
    display: grid;
    grid-template-columns: 120px calc(100% - 120px);
    grid-template-rows: 100%;
    user-select: none;
  }
  
  #user {
    background: #000;
    display: grid;
    color: #fff;
  }
  
  #container {
    background: #fff;
    overflow: hidden;
    position: relative;
  }
  
  #mask {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background: #ffffff55;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 60px;
    font-weight: 700;
    color: #000;
  }
  
  #ruleinfo {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background: #fff;
    z-index: 100;
    color: #000;
    overflow-y: auto;
  }
  
  #ruleinfo > ul > li {
    margin-top: 10px;
  }
  
  #blocks {
    height: 125%;
    background: #fff;
    display: grid;
    grid-template-columns: repeat(4, 25%);
    grid-template-rows: repeat(5, 20%);
    border: 1px solid black;
    box-sizing: border-box;
  }
  
  .block {
    border: 0.5px solid black;
  }
  
  @keyframes error {
    0% {
      background-color: red;
    }
    100% {
      background-color: #aaa;
    }
  }
  
  .block.error {
    animation: error 200ms ease 100ms 3;
  }
  
  .isBlack {
    background: #000;
  }
  
  #user {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }
  
  .user-info {
    font-weight: 700;
    width: 100%;
    padding-left: 15px;
    line-height: 30px;
    padding-top: 20px;
  }
  
  #score {
    font-size: 30px;
  }
  
  .user-action {
    height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding-bottom: 1px;
    padding-left: 1px;
    box-sizing: border-box;
  }
  
  .user-action > button {
    flex: 1;
    background-color: #fff;
    outline: none;
    border: none;
    margin-top: 1px;
    font-weight: 700;
  }
  
  .user-action > button:active {
    transform: scale(0.95);
  }