:root {
  --primary: #4361ee;
  --secondary: #3a0ca3;
  --success: #4cc9f0;
  --danger: #f72585;
  --light: #f8f9fa;
  --dark: #212529;
}
/* ... all of your other CSS styles ... */
body {
  font-family: 'Poppins', sans-serif;
  background: #f5f7fa;
  margin: 0;
  padding: 0;
  color: #2b2d42;
}
#container {
  max-width: 750px;
  width: 100%;
  margin: 0 auto;
  background: white;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  padding: 20px;
  position: relative;
  box-sizing: border-box;
}
/* ... paste all the rest of your provided CSS here ... */