Login/signup form animation

HTML

CSS

@import url("https://fonts.googleapis.com/css?family=Fira+Sans");
html, body {
  position: relative;
  min-height: 100vh;
  background-color: #E1E8EE;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Fira Sans", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.form-structor {
  background-color: #222;
  border-radius: 15px;
  height: 550px;
  width: 350px;
  position: relative;
  overflow: hidden;
}
.form-structor::after {
  content: "";
  opacity: 0.8;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-repeat: no-repeat;
  background-position: left bottom;
  background-size: 500px;
  background-image: url("https://scontent.feoh2-1.fna.fbcdn.net/v/t39.30808-6/436384089_948344076848806_3528099844495202909_n.jpg?_nc_cat=102&ccb=1-7&_nc_sid=833d8c&_nc_ohc=5Cnh5dbQ5h8Q7kNvgEKv736&_nc_ht=scontent.feoh2-1.fna&oh=00_AYD1_4s8a2lcnC7ySHzgg5Ut3MxmtwdfC3hkVHQ9wyL1Aw&oe=66D133D2");
}
.form-structor .signup {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  width: 65%;
  z-index: 5;
  -webkit-transition: all 0.3s ease;
}
.form-structor .signup.slide-up {
  top: 5%;
  -webkit-transform: translate(-50%, 0%);
  -webkit-transition: all 0.3s ease;
}
.form-structor .signup.slide-up .form-holder, .form-structor .signup.slide-up .submit-btn {
  opacity: 0;
  visibility: hidden;
}
.form-structor .signup.slide-up .form-title {
  font-size: 1em;
  cursor: pointer;
}
.form-structor .signup.slide-up .form-title span {
  margin-right: 5px;
  opacity: 1;
  visibility: visible;
  -webkit-transition: all 0.3s ease;
}
.form-structor .signup .form-title {
  color: #fff;
  font-size: 1.7em;
  text-align: center;
}
.form-structor .signup .form-title span {
  color: rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  -webkit-transition: all 0.3s ease;
}
.form-structor .signup .form-holder {
  border-radius: 15px;
  background-color: #fff;
  overflow: hidden;
  margin-top: 50px;
  opacity: 1;
  visibility: visible;
  -webkit-transition: all 0.3s ease;
}
.form-structor .signup .form-holder .input {
  border: 0;
  outline: none;
  box-shadow: none;
  display: block;
  height: 30px;
  line-height: 30px;
  padding: 8px 15px;
  border-bottom: 1px solid #eee;
  width: 100%;
  font-size: 12px;
}
.form-structor .signup .form-holder .input:last-child {
  border-bottom: 0;
}
.form-structor .signup .form-holder .input::-webkit-input-placeholder {
  color: rgba(0, 0, 0, 0.4);
}
.form-structor .signup .submit-btn {
  background-color: rgba(0, 0, 0, 0.4);
  color: rgba(255, 255, 255, 0.7);
  border: 0;
  border-radius: 15px;
  display: block;
  margin: 15px auto;
  padding: 15px 45px;
  width: 100%;
  font-size: 13px;
  font-weight: bold;
  cursor: pointer;
  opacity: 1;
  visibility: visible;
  -webkit-transition: all 0.3s ease;
}
.form-structor .signup .submit-btn:hover {
  transition: all 0.3s ease;
  background-color: rgba(0, 0, 0, 0.8);
}
.form-structor .login {
  position: absolute;
  top: 20%;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #fff;
  z-index: 5;
  -webkit-transition: all 0.3s ease;
}
.form-structor .login::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -20px;
  -webkit-transform: translate(-50%, 0);
  background-color: #fff;
  width: 200%;
  height: 250px;
  border-radius: 50%;
  z-index: 4;
  -webkit-transition: all 0.3s ease;
}
.form-structor .login .center {
  position: absolute;
  top: calc(50% - 10%);
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  width: 65%;
  z-index: 5;
  -webkit-transition: all 0.3s ease;
}
.form-structor .login .center .form-title {
  color: #000;
  font-size: 1.7em;
  text-align: center;
}
.form-structor .login .center .form-title span {
  color: rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  -webkit-transition: all 0.3s ease;
}
.form-structor .login .center .form-holder {
  border-radius: 15px;
  background-color: #fff;
  border: 1px solid #eee;
  overflow: hidden;
  margin-top: 50px;
  opacity: 1;
  visibility: visible;
  -webkit-transition: all 0.3s ease;
}
.form-structor .login .center .form-holder .input {
  border: 0;
  outline: none;
  box-shadow: none;
  display: block;
  height: 30px;
  line-height: 30px;
  padding: 8px 15px;
  border-bottom: 1px solid #eee;
  width: 100%;
  font-size: 12px;
}
.form-structor .login .center .form-holder .input:last-child {
  border-bottom: 0;
}
.form-structor .login .center .form-holder .input::-webkit-input-placeholder {
  color: rgba(0, 0, 0, 0.4);
}
.form-structor .login .center .submit-btn {
  background-color: #6B92A4;
  color: rgba(255, 255, 255, 0.7);
  border: 0;
  border-radius: 15px;
  display: block;
  margin: 15px auto;
  padding: 15px 45px;
  width: 100%;
  font-size: 13px;
  font-weight: bold;
  cursor: pointer;
  opacity: 1;
  visibility: visible;
  -webkit-transition: all 0.3s ease;
}
.form-structor .login .center .submit-btn:hover {
  transition: all 0.3s ease;
  background-color: rgba(0, 0, 0, 0.8);
}
.form-structor .login.slide-up {
  top: 90%;
  -webkit-transition: all 0.3s ease;
}
.form-structor .login.slide-up .center {
  top: 10%;
  -webkit-transform: translate(-50%, 0%);
  -webkit-transition: all 0.3s ease;
}
.form-structor .login.slide-up .form-holder, .form-structor .login.slide-up .submit-btn {
  opacity: 0;
  visibility: hidden;
  -webkit-transition: all 0.3s ease;
}
.form-structor .login.slide-up .form-title {
  font-size: 1em;
  margin: 0;
  padding: 0;
  cursor: pointer;
  -webkit-transition: all 0.3s ease;
}
.form-structor .login.slide-up .form-title span {
  margin-right: 5px;
  opacity: 1;
  visibility: visible;
  -webkit-transition: all 0.3s ease;
}

JS

Login/signup form animation

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