@import url('https://fonts.googleapis.com/css?family=Montserrat:400,800&display=swap');
*
{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Montserrat', sans-serif;
}
body
{
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #374155;
  transition: 0.5s;
}
body.active{
    background: #374155;
}
.container
{
  position: relative;
  top: 40px;
  width: 800px;
  height: 600px;
  margin: 20px;
}
.blueBg
{
  position: absolute;
  top: 40px;
  width: 100%;
  height: 520px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(243,148,38,31);
  box-shadow: 0 5px 45px rgba(0,0,0,0.15);
}
.blueBg .box
{
  position: relative;
  width: 50%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
.blueBg .box h2
{
  color: #fff;
  font-size: 1.5em;
  font-weight: 500;
  margin-bottom: 10px;

}
.blueBg .box button
{
  cursor: pointer;
  padding: 10px 20px;
  background: #fff;
  color: #333;
  font-size: 16px;
  font-weight: 500;
  border: none;
}
.formBx
{
  position: absolute;
  top: 0;
  left: 0;
  width: 50%;
  height: 100%;
  background: #fff;
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 5px 45px rgba(0,0,0,0.25);
  transition: 0.5s ease-in-out;
  overflow: hidden;
}
.formBx.active
{
  left: 50%;
}

.formBx .form
{
  position: absolute;
  left: 0;
  width: 100%;
  padding: 50px;
  transition: 0.5s;
}
.formBx .signinForm
{
  transition-delay: 0.25s;
}
.formBx.active .signinForm
{
  left: -100%;
  transition-delay: 0s;
}
.formBx .signupForm
{
  left: 100%;
  transition-delay: 0s;
}
.formBx.active .signupForm
{
  left: 0;
  transition-delay: 0.25s;
}
.formBx .form form
{
  width: 100%;
  display: flex;
  flex-direction: column;
}
.formBx .form form h3
{
  font-size: 1.5em;
  color: #333;
  margin-bottom: 20px;
  font-weight: 500;
}
.formBx .form form input
{
  width: 100%;
  margin-bottom: 20px;
  padding: 10px;
  outline: none;
  font-size: 16px;
}
.formBx .form form input[type="submit"]
{
  background: rgba(243,148,38,31);
  border: none;
  color: #fff;
  max-width: 100px;
  cursor: pointer;
}
.formBx.active .signupForm input[type="submit"]
{
  background: rgba(243,148,38,31);
}
.formBx .form form .forgot
{
  color: #333;
}

@media (max-width: 991px)
{
  .container
  {
    max-width: 400px;
    height: 650px;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  .container .blueBg
  {
    top: 0;
    height: 100%;
  }
  .formBx
  {
    width: 100%;
    height: 500px;
    top: 0;
    box-shadow: none;
  }
  .blueBg .box
  {
    position: absolute;
    width: 100%;
    height: 150px;
    bottom: 0;
  }
  .box.signin
  {
    top: 0;
  }
  .formBx.active
  {
    left: 0;
    top: 150px;
  }
}