style.css

@import url("https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Poppins", sans-serif;
  background: #f2f4f7;
}

.content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.flex-div {
  display: flex;
  justify-content: space-evenly;
  align-items: center;
}

.name-content {
  margin-right: 7rem;
}

.name-content .logo {
  font-size: 3.5rem;
  color: #1877f2;
}

.name-content p {
  font-size: 1.3rem;
  font-weight: 500;
  margin-bottom: 5rem;
}

form {
  display: flex;
  flex-direction: column;
  background: #fff;
  padding: 2rem;
  width: 530px;
  height: 380px;
  border-radius: 0.5rem;
  box-shadow: 0 2px 4px rgb(0 0 0 / 10%), 0 8px 16px rgb(0 0 0 / 10%);
}

form input {
  outline: none;
  padding: 0.8rem 1rem;
  margin-bottom: 0.8rem;
  font-size: 1.1rem;
}

form input:focus {
  border: 1.8px solid #1877f2;
}

form .login {
  outline: none;
  border: none;
  background: #1877f2;
  padding: 0.8rem 1rem;
  border-radius: 0.4rem;
  font-size: 1.1rem;
  color: #fff;
}

form .login:hover {
  background: #0f71f1;
  cursor: pointer;
}

form a {
  text-decoration: none;
  text-align: center;
  font-size: 1rem;
  padding-top: 0.8rem;
  color: #1877f2;
}

form hr {
  background: #f7f7f7;
  margin: 1rem;
}

form .create-account {
  outline: none;
  border: none;
  background: #06b909;
  padding: 0.8rem 1rem;
  border-radius: 0.4rem;
  font-size: 1.1rem;
  color: #fff;
  width: 75%;
  margin: 0 auto;
}

form .create-account:hover {
  background: #03ad06;
  cursor: pointer;
}

/* //.........Media Query.........// */

@media (max-width: 500px) {
  html {
    font-size: 60%;
  }

  .name-content {
    margin: 0;
    text-align: center;
  }

  form {
    width: 300px;
    height: fit-content;
  }

  form input {
    margin-bottom: 1rem;
    font-size: 1.5rem;
  }

  form .login {
    font-size: 1.5rem;
  }

  form a {
    font-size: 1.5rem;
  }

  form .create-account {
    font-size: 1.5rem;
  }

  .flex-div {
    display: flex;
    flex-direction: column;
  }
}

@media (min-width: 501px) and (max-width: 768px) {
  html {
    font-size: 60%;
  }

  .name-content {
    margin: 0;
    text-align: center;
  }

  form {
    width: 300px;
    height: fit-content;
  }

  form input {
    margin-bottom: 1rem;
    font-size: 1.5rem;
  }

  form .login {
    font-size: 1.5rem;
  }

  form a {
    font-size: 1.5rem;
  }

  form .create-account {
    font-size: 1.5rem;
  }

  .flex-div {
    display: flex;
    flex-direction: column;
  }
}

@media (min-width: 769px) and (max-width: 1200px) {
  html {
    font-size: 60%;
  }

  .name-content {
    margin: 0;
    text-align: center;
  }

  form {
    width: 300px;
    height: fit-content;
  }

  form input {
    margin-bottom: 1rem;
    font-size: 1.5rem;
  }

  form .login {
    font-size: 1.5rem;
  }

  form a {
    font-size: 1.5rem;
  }

  form .create-account {
    font-size: 1.5rem;
  }

  .flex-div {
    display: flex;
    flex-direction: column;
  }

  @media (orientation: landscape) and (max-height: 500px) {
    .header {
      height: 90vmax;
    }
  }  
}