* {
  box-sizing: border-box;
}

body {
  background: #f6f8fb;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.container {
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 14px 28px rgba(0,0,0,0.25),
              0 10px 10px rgba(0,0,0,0.22);
  position: relative;
  overflow: hidden;
  width: 900px;
  max-width: 100%;
  min-height: 500px;
}

.form-container {
  position: absolute;
  top: 0;
  height: 100%;
  transition: all 0.6s ease-in-out;
}

.sign-in-container {
  left: 0;
  width: 50%;
  z-index: 2;
}

.container.right-panel-active .sign-in-container {
  transform: translateX(100%);
}

.sign-up-container {
  left: 0;
  width: 50%;
  opacity: 0;
  z-index: 1;
}

.container.right-panel-active .sign-up-container {
  transform: translateX(100%);
  opacity: 1;
  z-index: 5;
}

form {
  background-color: #fff;
  display: flex;
  flex-direction: column;
  padding: 0 50px;
  height: 100%;
  justify-content: center;
  align-items: center;
  text-align: center;
}

form input {
  background-color: #eee;
  border: none;
  padding: 12px 15px;
  margin: 8px 0;
  width: 100%;
}

button {
  border-radius: 20px;
  border: 1px solid #5777ba;
  background-color: #5777ba;
  color: #fff;
  font-size: 12px;
  font-weight: bold;
  padding: 12px 45px;
  margin-top: 10px;
  cursor: pointer;
}

button.ghost {
  background-color: transparent;
  border-color: #fff;
}

.overlay-container {
  position: absolute;
  top: 0;
  left: 50%;
  width: 50%;
  height: 100%;
  overflow: hidden;
  transition: transform 0.6s ease-in-out;
  z-index: 100;
}

.container.right-panel-active .overlay-container {
  transform: translateX(-100%);
}

.overlay {
  background: linear-gradient(to right, #5777ba, #748ec6);
  color: #fff;
  position: relative;
  left: -100%;
  height: 100%;
  width: 200%;
  transform: translateX(0);
  transition: transform 0.6s ease-in-out;
}

.container.right-panel-active .overlay {
  transform: translateX(50%);
}

.overlay-panel {
  position: absolute;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 0 40px;
  text-align: center;
  top: 0;
  height: 100%;
  width: 50%;
}

.overlay-left {
  transform: translateX(-20%);
}

.container.right-panel-active .overlay-left {
  transform: translateX(0);
}

.overlay-right {
  right: 0;
  transform: translateX(0);
}

.container.right-panel-active .overlay-right {
  transform: translateX(20%);
}

.error {
  color: red;
  font-size: 14px;
}

.success {
  color: green;
  font-size: 14px;
}