.dokucrypt3pw_prompt {
  position:fixed;
  left: 50%;
  top:50%;
  margin-left:-100px;
  padding:15px;
  width:200px;
  border:1px solid black;
  background-color:white;
  z-index: 999;
}
.dokucrypt3pw_prompt label {
  display:block; 
  margin-bottom:5px;
}
.dokucrypt3pw_prompt input {
  margin-bottom:10px;
}