Formulaire de connexion responsive

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Exemple de modèle HTML de base

HTML

<html>
<head>
  <meta charset="utf-8" />
  <title>Webleb</title>
  <link href="/css/styles.css" rel="stylesheet" type="text/css" />
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.3.0/css/all.min.css" integrity="sha512-SzlrxWUlpfuzQ+pcUCosxcglQRNAq/DZjVsC0lE40xsADsfeQoEypE+enwcOiGjk/bSuGGKHEyjSoQ1zVisanQ==" crossorigin="anonymous" referrerpolicy="no-referrer" />
</head>
<body class="align">
  <div class="grid">
    <form  method="POST" class="form login">
      <div class="form_field">
        <label><i class="fa fa-user" style="color: #606468;"></i></label>
        <input type="text" name="username" class="form_input" placeholder="Username" required>
      </div>
      <div class="form_field">
        <label><i class="fa fa-lock" style="color: #606468;"></i></label>
        <input type="password" name="password" class="form_input" placeholder="Password" required>
      </div>
      <div class="form_field">
        <button class="submitButton" type="submit">Submit</button>
      </div>
    </form>
    <p class="text--center">Not a member? <a href="https://www.web-leb.com/code">Register</a></p>
  </div>
</body>
</html>

CSS

.align{
  display: grid;
  place-items: center;
}
.grid {
  inline-size: 90%;
  margin-inline: auto;
  max-inline-size: 20rem;
}
* {
  box-sizing: inherit;
}
html {
  box-sizing: border-box;
  font-size: 100%;
}
body {
  background: -webkit-linear-gradient(to right, #ffffff, #abbaab);
  background: linear-gradient(to right, #ffffff, #abbaab); 
  color: #606468;
  font-family: "Open Sans", sans-serif;
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.5;
  margin: 0;
  min-block-size: 100vh;
}
a {
  color: #606468;
  outline: 0;
  text-decoration: none;
}
input {
  background-image: none;
  border: 0;
  color: inherit;
  font: inherit;
  margin: 0;
  outline: 0;
  padding: 0;
  transition: background-color 0.3s;
}
input[type="submit"] {
  cursor: pointer;
  text-decoration: none;
}
.form {
  display: grid;
  gap: 0.875rem;
}
.form input[type="password"],
.form input[type="text"],
.submitButton {
  inline-size: 100%;
}
.form_field {
  display: flex;
}
.form_input {
  flex: 1;
}
.login {
  color: #eee;
}
.login label,
.login input[type="text"],
.login input[type="password"],
.submitButton {
  border-radius:0.25rem;
  padding: 1rem;
}
.login label {
  background-color: #363b41;
  border-bottom-right-radius: 0;
  border-top-right-radius: 0;
  padding-inline: 1.25rem;
}
.login input[type="password"],
.login input[type="text"] {
  background-color: #3b4148;
  border-bottom-left-radius: 0;
  border-top-left-radius: 0;
}
.login input[type="password"]:hover,
.login input[type="text"]:hover {
  background-color: #434a52;
}
.submitButton {
  background-color: #270cbf;
  color: #eee;
  font-weight: 700;
  text-transform: uppercase;
  border: none;
  cursor: pointer;
}
.submitButton:hover {
  background-color: #3200e6;
}
p {
  margin-block: 1.5rem;
}
.text--center {
  text-align: center;
}