*{
    margin: 0;
    padding: 0;
  }
  body {
    background-color: #000;
  }
  
  .box{
    width: 550px;
    height: 450px;
    /* width: 100%;
    height: 100%; */
    background-color: #000;
    position:absolute;
    top: calc(50% - 75px);
    left: calc(50% - 150px);
    border-radius: 10px;
    font-size: 16px;
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: space-evenly;
    align-items: center;
  }
  .btn {
    width: 120px;
    height: 35px;
    line-height: 35px;
    color: #fff;
    border: 2px solid #fff;
    border-radius: 10px;
    font-size: 20px;
    transition: 0.5s;
    text-align: center;
    cursor:default;
    opacity: 0.5;
  }
  img{
    width: 100%;
    height:100%;
  }