input.knopka {
background-color:#efefef;
border-style: ridge;
}
input.knopka:hover {
background-color:#B5ACE7;
color: #ffffff;
border-style: ridge;
}

input.knopkagreen {
background-color:#efefef;
border-style: ridge;
}
input.knopkagreen:hover {
background-color:#BBF0AA;
color: #0000ff;
border-style: ridge;
}

input.knopkared {                       
background-color:#efefef;
border-style: ridge;
color: #FF0000;
}
input.knopkared:hover {                 
background-color:#F66C7F;
border-style: ridge;
color: #000000;
}