body{
    background-color: darkolivegreen;
}
button.download {
background-color: red;
position: static;
color: black;
}

a.Backbtn {
    text-decoration: none;
    color: black;
}
a.Workbook{
    color: yellow;
}
img {
     max-width: 400px;
    margin:auto;
    display: block;
    height: 500px;
    border: 2.5px solid;
}