* {
  margin: 0;
  padding: 0;
}

body {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

#login-box > form > div {
  margin: 20px;
}

#login-box div.input-box {
  position: relative;
  display: flex;
  height: 30px;
}

#login-box div.input-box label,
#login-box div.input-box div.sign {
  height: 30px;
  line-height: 30px;
}

#login-box div.input-box input {
  height: 20px;
  margin: auto 0;
}

#login-box div.input-box input:focus {
  outline-color: slateblue;
}

#login-box div.input-box div.sign {
  display: inline;
  color: red;
  margin: 0 10px;
}

#login-box div.input-box div.prompt {
  position: absolute;
  left: 100%;
  height: 30px;
  width: max-content;
  line-height: 30px;
  color: rgb(55, 55, 55);
  padding: 0 5px;
}

#login-box div.input-box div.prompt > img {
  margin-right: 5px;
}

#login-box div.input-box .forbid {
  background-color: lightcoral;
}

#login-box div.input-box .pass {
  background-color: lightgreen;
}

#login-box div#btn-box {
  margin-top: 25px;
}

#login-box div#btn-box input {
  padding: 5px 20px;
  margin: 0 20px;
}