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Plantilla de formulario de inicio de sesión más sencilla

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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 rel="stylesheet" href="/css/styles.css">
</head>
<body>
  <body class="align">

<div class="grid">
  
      <form action="/" method="post" class="form login">
  
        <header class="login__header">
          <h3 class="login__title">Login</h3>
        </header>
  
        <div class="login__body">
  
          <div class="form__field">
            <input type="email" placeholder="Email" required>
          </div>
  
          <div class="form__field">
            <input type="password" placeholder="Password" required>
          </div>
  
        </div>
  
        <footer class="login__footer">
          <input type="submit" value="Login">
  
          <p><span class="icon icon--info">?</span><a href="#">Forgot Password</a></p>
        </footer>
  
      </form>
  
    </div>
  
  </body>
</body>
</html>

CSS

.align {
  display: grid;
  place-items: center;
}
:root {
  --gridMaxWidth: 24em;
  --gridWidth: 90%;
}
.grid {
  inline-size: var(--gridWidth);
  margin-inline: auto;
  max-inline-size: var(--gridMaxWidth);
}
.icon {
  block-size: 1.25em;
  display: inline-block;
  inline-size: 1.25em;
  line-height: 1.25em;
  margin-right: 0.625em;
  text-align: center;
  vertical-align: middle;
}
.icon--info {
  background-color: #e5e5e5;
  border-radius: 50%;
}
:root {
  --bodyBackgroundColor: #eaeaea;
  --bodyColor: #999;
  --bodyFontFamily: "Helvetica", "Arial";
  --bodyFontFamilyFallback: sans-serif;
  --bodyFontSize: 0.875rem;
  --bodyFontWeight: 400;
  --bodyLineHeight: 1.5;
}
*,
*::before,
*::after {
  box-sizing: inherit;
}
html {
  box-sizing: border-box;
}
body {
  background-color: var(--bodyBackgroundColor);
  font-family: var(--bodyFontFamily), var(--bodyFontFamilyFallback);
  font-size: var(--bodyFontSize);
  font-weight: var(--bodyFontWeight);
  line-height: var(--bodyLineHeight);
  margin: 0;
  min-block-size: 100vh;
}
:root {
  --anchorColor: inherit;
  --anchorHoverColor: #1dabb8;
}
a {
  color: var(--anchorColor);
  text-decoration: none;
  transition: color 0.3s;
}
a:hover {
  color: var(--anchorHoverColor);
}
fieldset {
  border: none;
  margin: 0;
}
input {
  appearance: none;
  border: none;
  font: inherit;
  margin: 0;
  outline: none;
  padding: 0;
}
input[type="submit"] {
  cursor: pointer;
}
.form input[type="email"],
.form input[type="password"] {
  inline-size: 100%;
}
:root {
  --loginBorderRadius: 0.25em;
  --loginHeaderBackgroundColor: #282830;
  --loginInputBorderRadius: 0.25em;
}
.login__header {
  background-color: var(--loginHeaderBackgroundColor);
  border-top-left-radius: var(--loginBorderRadius);
  border-top-right-radius: var(--loginBorderRadius);
  color: #fff;
  padding: 1.5em;
  text-align: center;
  text-transform: uppercase;
}
.login__title {
  font-size: 1rem;
  margin: 0;
}
.login__body {
  background-color: #fff;
  padding: 1.5em;
  position: relative;
}
.login__body::before {
  background-color: #fff;
  content: "";
  height: 0.5em;
  left: 50%;
  margin-left: -0.25em;
  margin-top: -0.25em;
  position: absolute;
  top: 0;
  transform: rotate(45deg);
  width: 0.5em;
}
.login input[type="email"],
.login input[type="password"] {
  border: 0.0625em solid #e5e5e5;
  padding: 1em 1.25em;
}
.login input[type="email"] {
  border-top-left-radius: var(--loginInputBorderRadius);
  border-top-right-radius: var(--loginInputBorderRadius);
}
.login input[type="password"] {
  border-bottom-left-radius: var(--loginInputBorderRadius);
  border-bottom-right-radius: var(--loginInputBorderRadius);
  border-top: 0;
}
.login input[type="submit"] {
  background-color: #1dabb8;
  border-radius: var(--loginInputBorderRadius);
  color: #fff;
  font-weight: 700;
  order: 1;
  padding: 0.75em 1.25em;
  transition: background-color 0.3s;
}
.login input[type="submit"]:focus,
.login input[type="submit"]:hover {
  background-color: #198d98;
}
.login__footer {
  align-items: center;
  background-color: #fff;
  border-bottom-left-radius: var(--loginBorderRadius);
  border-bottom-right-radius: var(--loginBorderRadius);
  display: flex;
  justify-content: space-between;
  padding-bottom: 1.5em;
  padding-left: 1.5em;
  padding-right: 1.5em;
}
.login__footer p {
  margin: 0;
}