* {
    margin: 0;
    padding: 0;
  }
  
  html,
  body {
    width: 100%;
    height: 100%;
  }
  .container {
    background-image: url("/static/bg.png");
    background-size: cover;
    background-position: center; 
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
  }
  .content {
    position: absolute;
    bottom: 10vh;
    display: flex;
    width: 90%;
    max-width: 400px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  .logo {
    float:left;
    position: absolute;
    top: 0;
    left: 0;
    width: 40%;
    max-width: 250px;
  }
  
  .text {
    width: 100%;
  }
  
  .btn-group {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
  }
  
  .btn {
    background-color: transparent;
    padding: 0;
    width: 30%;
    transition: .2s;
  }
  
  .btn:hover {
    transform: scale(1.1);
  }
  
  .btn-img {
    width: 100%;
    max-width: 100px;
  }

  .opacity {
    opacity: 0.4;
  }

  .hide-ele {
    display: none;
  }

  .mask {
    background-color: #000;
  }

  .mask::before {
    content: "";
    background-image: url("/static/mask.png");
    background-size: 100% auto; /* 宽度自适应，高度自动调整以保持比例 */
    background-repeat: no-repeat;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
  }