body {
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

.container {
    width: 80%;
    margin: auto;
    padding: 20px;
}

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

form {
    display: flex;
    flex-direction: column; /* 縦に並べる */
    margin-bottom: 20px;
}

input[type="text"], input[type="date"] {
    padding: 10px;
    margin-bottom: 10px; /* 各要素の間にスペースを追加 */
}

button {
    background: #333;
    color: #fff;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
}

button:hover {
    background: #555;
}

ul {
    padding: 0;
}

li {
    background: #fff;
    border: 1px solid #ddd;
    margin-bottom: 5px;
    padding: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.expired {
    background-color: #ffcccc;
}

.delete-btn {
    background-color: #ff4d4d;
    color: white;
    border: none;
    padding: 5px 10px;
    cursor: pointer;
}

.delete-btn:hover {
    background-color: #ff1a1a;
}