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    <meta name="viewport" content="width=device-width, inital-scale=1.0" />
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    <title>CSS</title>
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    <section>

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        <div class="signin">
            <div class="content">
                <h2>Sign In</h2>
                <div class="form">
                    <div class="inputBx">
                        <input type="text" required>
                        <i>Usrname</i>
                    </div>
                    <div class="inputBx">
                        <input type="password" required>
                        <i>Password</i>
                    </div>
                    <div class="links">
                        <a href="#">Forgot Password</a>
                        <a href="#">Signup</a>
                    </div>
                    <div class="inputBx">
                        <input type="submit" value="Login">
                    </div>
                </div>
            </div>
        </div>
    </section>
  </body>
</html>
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Quicksand", sans-serif;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #000;
}
section {
  position: absolute;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2px;
  flex-wrap: wrap;
  overflow: hidden;
}
section::before
{
    content: " ";
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(#000, #FF9933, #000);
    animation: animate 5s linear infinite;
}
@keyframes animate
{
    0%
    {
        transform: translateY(-100%);
    }
    100%
    {
        transform: translateY(100%);
    }
}
section span {
  position: relative;
  display: block;
  width: calc(6.25vw - 2px);
  height: calc(6.25vw - 2px);
  background: #181818;
  z-index: 2;
  transition: 1.5s;
}
section span:hover
{
    background: #FF9933;
    transition: 0s;
}
section .signin {
  position: absolute;
  width: 400px;
  background: #222;
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 40px;
  border-radius: 4px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
}
section .signin .content {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  gap: 40px;
}
section .signin .content h2 {
  font-size: 2em;
  color: #FF9933;
  text-transform: uppercase;
}
section .signin .content .form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 25px;
}
section .signin .content .form .inputBx {
  position: relative;
  width: 100%;
}
section .signin .content .form .inputBx input {
  position: relative;
  width: 100%;
  background: #333;
  border: none;
  outline: none;
  padding: 25px 10px 7.5px;
  border-radius: 4px;
  color: #fff;
  font-weight: 500;
  font-size: 1em;
}
section .signin .content .form .inputBx i {
  position: absolute;
  left: 0;
  padding: 15px 10px;
  font-style: normal;
  color: #aaa;
  transition: 0.5s;
  pointer-events: none;
}
.signin .content .form .inputBx input:focus ~ i,
.signin .content .form .inputBx input:valid ~ i {
  transform: translateY(-7.5px);
  font-size: 0.8em;
  color: #fff;
}
.signin .content .form .links {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: space-between;
}
.signin .content .form .links a {
  color: #fff;
  text-decoration: none;
}
.signin .content .form .links a:nth-child(2) {
  color: #FF9933;
  font-weight: 600;
}
.signin .content .form .inputBx input[type="submit"] {
  padding: 10px;
  background: #FF9933;
  color: #111;
  font-weight: 600;
  font-size: 1.25em;
  letter-spacing: 0.05em;
  cursor: pointer;
}
@media (max-width: 600px) {
  section span {
    width: calc(20vw - 2px);
    height: calc(23vw - 2px);
  }
}