body {
   font-family: Arial, sans-serif;
   background-color: #f0f0f0;
   display: flex;
   justify-content: center;
   align-items: center;
   height: 100vh;
   margin: 0;
}

.container {
   background-color: white;
   padding: 2rem;
   border-radius: 8px;
   box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
   max-width: 400px;
   width: 100%;
}

h1 {
   text-align: center;
   color: #333;
}

p {
   text-align: center;
   color: #666;
   margin-bottom: 1.5rem;
}

.input-group {
   display: flex;
   align-items: center;
   margin-bottom: 1rem;
}

.input-group i {
   color: #999;
   margin-right: 0.5rem;
}

input[type="text"] {
   flex: 1;
   padding: 0.5rem;
   border: 1px solid #ccc;
   border-radius: 4px;
   font-size: 1rem;
   outline: none;
}

button {
   display: flex;
   align-items: center;
   justify-content: center;
   width: 100%;
   padding: 0.5rem;
   background-color: #4CAF50;
   color: white;
   border: none;
   border-radius: 4px;
   font-size: 1rem;
   cursor: pointer;
   transition: background-color 0.3s;
}

button:hover {
   background-color: #45a049;
}

button i {
   margin-right: 0.5rem;
}

.error-message {
   display: none;
   color: #f44336;
   text-align: center;
   margin-top: 1rem;
}

.error-message.active {
   display: table;
}