body {
    font-family: sans-serif;
    background-color: #f4f4f9;
    color: #333;
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
}

header h1 {
    color: #4a90e2;
}

#task-form {
    background: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

input[type="text"] {
    padding: 10px;
    width: 70%;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    padding: 10px 15px;
    background-color: #4a90e2;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #357abd;
}

ul {
    list-style: none;
    padding: 0;
}

li {
    background: white;
    margin: 5px 0;
    padding: 10px;
    border-radius: 4px;
    border-left: 5px solid #4a90e2;
}