wallabag/app/Resources/static/themes/baggy/css/login.scss

.login {
  background-color: #333;

  #main {
    padding: 0;
    margin: 0;
  }

  form {
    background-color: #fff;
    padding: 1.5em;
    box-shadow: 0 1px 8px rgb(0 0 0 / 90%);
    width: 20em;
    position: absolute;
    top: 8em;
    left: 50%;
    margin-left: -10em;
  }

  .logo {
    position: absolute;
    top: 2em;
    left: 50%;
    margin-left: -55px;
  }
}