style.css

/* Container needed to position the button. Adjust the width as needed */
body{
  background-image: url("11.jpg");
  background-size: cover;
  background-repeat:no-repeat;
}


.container {
    position: relative;
    width: 100%;
  }
  
  /* Make the image responsive */
  .container img {
    
    width: 100%;
    height: 83vh;
    background-size: 100% 100%;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
  }
  
  /* Style the button and place it in the middle of the container/image */
  .container .btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    background-color: rgb(84, 158, 100);
    color: white;
    font-size: 16px;
    padding: 12px 24px;
    border: none;
    cursor: pointer;
     
  }
  
  .container .btn:hover {
    background-color: black;
  }

  .block {
    display: block;
    width: 20%;
    height:auto;
    border: none;
    background-color: #04AA6D;
    padding: 10px 10px;
    font-size: 16px;
    cursor: pointer;
    text-align: center;
  }