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HTML 

              
                <!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Login Form</title>
    <!-- Link to external CSS file -->
    <link rel="stylesheet" href="css/style.css" />
  </head>
  <body>
    <!-- Main container for the login form -->
    <div class="box">
      <form>
        <!-- Title section -->
        <div class="title">
          <h1>Login Form</h1>
        </div>
        <!-- Input fields container -->
        <div class="input-box">
          <!-- Username input -->
          <label for="text" class="label-color">User name</label>
          <input
            id="text"
            name="text"
            type="text"
            placeholder="Username"
            required
          />
          <br />
          <!-- Password input -->
          <label for="password" class="label-color">Password</label>
          <input
            id="password"
            name="password"
            type="password"
            placeholder="Password"
            required
          />
          <br />
          <!-- Login button -->
          <input type="submit" class="Login" value="Login" />
          <br />
          <!-- Forgot password link -->
          <p class="link-text">Forget password ? <a href="#">Click Here</a></p>
          <!-- Sign up link -->
          <p class="link-text">
            Dont have an account ?
            <a href="#">Click Here</a>
          </p>
        </div>
      </form>
    </div>
  </body>
</html>
!

CSS 

              
                /* Reset default styles and set font family */
* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

/* Center the content vertically and horizontally */
body {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #23242a;
  height: 100vh;
}

/* Main container styles */
.box {
  position: relative;
  width: 370px;
  height: 450px;
  background: #1c1c1c;
  border-radius: 50px 5px;
  overflow: hidden;
}

/* Create animated gradient border effect */
.box::before,
.box::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 370px;
  height: 450px;
  background: linear-gradient(60deg, transparent, #45f3ff, #45f3ff);
  transform-origin: bottom right;
  animation: animate 6s linear infinite;
}

.box::after {
  background: linear-gradient(60deg, transparent, #d9138a, #d9138a);
  animation-delay: -3s;
}

/* Keyframes for gradient animation */
@keyframes animate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Form container styles */
form {
  position: absolute;
  inset: 2px;
  background: #28292d;
  border-radius: 50px 5px;
  z-index: 10;
  padding: 30px 30px;
  display: flex;
  flex-direction: column;
}

/* Title styles */
.title {
  width: 100%;
}

.title h1 {
  color: #45f3ff;
  justify-content: center;
  font-size: 2rem;
  font-weight: 600;
  opacity: 0.9;
  margin-bottom: 20px;
}

/* Input box styles */
form .input-box {
  width: 100%;
  margin-top: 20px;
}

form .input-box input {
  width: 100%;
  background-color: rgba(255, 255, 255, 0.2);
  border: none;
  outline: none;
  border-width: 3px;
  border-radius: 15px;
  padding: 10px 20px;
  font-size: 1rem;
  margin: 10px 0px 10px 0px;
  color: white;
}

form .input-box input::placeholder {
  color: #cdd1d2;
}

/* Submit button styles */
form .input-box input[type="submit"] {
  background-color: #45f3ff;
  cursor: pointer;
  color: #16100e;
  filter: drop-shadow(0 5px 10px #45f3ff);
  margin-bottom: 20px;
}

/* Link text styles */
form .link-text {
  padding-top: 15px;
  color: rgb(103, 173, 183);
  font-size: 0.85rem;
}

form .link-text a {
  text-decoration: none;
  color: rgb(153, 41, 99);
  font-weight: 700;
}

/* Label color */
.label-color {
  color: #9eb3b5;
}
!

JS
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999px

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