body {
    background-color: tomato;
}
div {
    width:100vw;
    height:100vh;
    background:blueviolet;
    display:table-cell;
    vertical-align:middle;
    text-align:center;
    border-radius: 25px;
  }
  img {
    max-width:100%;
    height:auto;
    max-height:100%;
    border-radius: 25px;
    margin: 1rem;
}
#header {
    font: Verdana, Geneva, Tahoma, sans-serif;
    font-size: 2rem;
    font-weight: bold;
    color: white;
    margin: 1rem;
}

.feedback {
    position: fixed;
    bottom: 0;
    right: 0;
    margin: 1rem;
    border-radius: 25px;
    background-color: teal;
    border-color: teal;
  }
  
  #mybutton {
    position:relative;
    width: fit-content; 
  /* To adjust the height as well */ 
    height: fit-content;   
  }

  #footer {
    margin-left: 1rem;
  }