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

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    padding-top: 50px;
}

.app-container {
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    width: 300px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

#todo-input {
    margin-top: 10px;
    padding: 4px 8px;
}

#add-btn {
    padding: 4px 8px;

}

ul {
    list-style: none;
}

li {
    padding: 8px;
    border-bottom: 1px solid #ddd;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.completed {
    text-decoration: line-through;
    color: gray;
}

.delete-btn {
    background: red;
    color: white;
    padding: 5px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}