* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f0f2f5;
}

.container {
    max-width: 600px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    color: #1a73e8;
    margin-bottom: 2rem;
}

form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

input {
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

button {
    padding: 0.8rem;
    background-color: #1a73e8;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
}

button:hover {
    background-color: #1557b0;
}

.lista-cumpleanos {
    margin-top: 2rem;
}

ul {
    list-style: none;
}

li {
    padding: 1rem;
    border-bottom: 1px solid #ddd;
    display: flex;
    justify-content: space-between;
}