style3.css

* {
  padding: 0;
  margin: 0;
  text-decoration: none;
  list-style: none;
  box-sizing: border-box;
}

.container {
  width: 100%;
  height: 100vh;
  background-image: url("b3.webp");
  background-position: center;
  background-size: cover;
  background: url(https://images.unsplash.com/photo-1472289065668-ce650ac443d2?w=500&auto=format&fit=crop&q=60&ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxzZWFyY2h8MTl8fGVkdWNhdGlvbmFsfGVufDB8fDB8fHww) no-repeat center center/cover;
  position: relative;

}

.form-box {

  width: 90%;

  max-width: 450px;

  position: absolute;

  top: 50%;

  left: 50%;


  transform: translate(-50%, -50%);

  background: #fff;

  padding: 50px 60px 70px;

  text-align: center;



}

.form-box h1 {
  font-size: 30px;
  margin-bottom: 60px;
  color: brown;
  position: relative;
}

.form-box h1::after {
  content: '';
  width: 30px;
  height: 4px;
  border-radius: 3px;

  background: brown;
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
}

.input-field {
  background: #eaeaea;
  margin: 15px 0;
  border-radius: 15px 0;
  display: flex;
  align-items: center;
  max-height: 65px;
  transition: max-height 0.5s;
  overflow: hidden;
}

input {
  width: 100%;
  background: transparent;
  border: 0;
  outline: 0;
  padding: 18px 15px;
}

.input-field i {
  margin-left: 50px;
  color: #999;

}

form p {
  text-align: left;
  font-size: 13px;

}

form p a {
  text-decoration: none;
  color: brown;
}

.btn-field {
  width: 100%;
  display: flex;
  justify-content: space-between;

}

.btn-field button {
  flex-basis: 48%;
  background: brown;
  color: #fff;
  height: 40px;
  border-radius: 20px;
  border: 0;
  outline: 0;
  cursor: pointer;
  transition: background 1s;
}

.input-group {
  height: 250px;
}

.btn-field button.disable {
  background: #eaeaea;
  color: #555;

}