body {
  font-family: Arial;
  background: #f5f5f5;
  padding: 15px;
}
div {
  background: #fff;
  padding: 10px;
  border-radius: 8px;
}
button {
  background: #1e90ff;
  color: #fff;
  border: 0;
  padding: 10px;
  width: 100%;
  border-radius: 6px;
}
body {
  background: linear-gradient(135deg, #0f62fe, #4dabf7);
  font-family: Arial, sans-serif;
}

.login-box {
  background: #fff;
  max-width: 360px;
  margin: 80px auto;
  padding: 25px;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,.15);
}