.captcha {
  width: 16vw;
  height: 11.2vw;
  background-color: #3c3c3c;
  position: relative;
}

.captcha .captcha-code {
  margin: 1vw 0 0 0;
  padding: 0;
  font-size: 1.9vw;
  letter-spacing: 0.3em;
  text-align: center;
  user-select: none;
}

.captcha .captcha-input {
  font: inherit;
  color: rgb(36, 36, 36);
  display: block;
  margin: 1vw auto;
  width: 70%;
  border: none;
  background-color: rgb(235, 235, 235);
  border-radius: 0.2vw;
  font-size: 1.9vw;
  text-align: center;
  letter-spacing: 0.3em;
}

.captcha .captcha-btn {
  display: block;
  margin: 1vw auto;
  padding: 0.4vw 1.2vw;
  border: none;
  background-color: rgb(235, 235, 235);
  font-size: 1.2vw;
  border-radius: 0.3vw;
  text-align: center;
  cursor: pointer;
  transition: 0.1s ease-in-out;
}

.captcha .captcha-btn:hover {
  box-shadow: 0.2vw 0.2vw 0.5vw rgba(0, 0, 0, 0.5);
  letter-spacing: 0.05vw;
  font-size: 1.3vw;
}