body{
    background-color:cadetblue;
}
#form{
background-color:olivedrab;
width:25%;
margin:120px auto;
padding: 40px;
box-shadow: 10px 10px 5px rgb(82,11,77);
border-radius: 15px;
}
#btn{
    color:bisque;
    background-color:brown;
    padding: 10px;
    font-size: large;
    box-shadow: 5px;
    border-radius: 10px;
    cursor: pointer;
}
/* make it responsive */
@media screen and (max-width:700px)
{
    #form
    {
        width:65%;
        padding:30px;
    }
    
}