:root {
    --bgColor: #f7f2f2;
    --textColor: #3f3f3f;
}

.dark {
    --bgColor: #3f3f3f;
    --textColor: #f7f2f2;
}

body {
    box-sizing: border-box;
    background-color: var(--bgColor);
    color: var(--textColor);
    width: 100%;
    margin: 0;
    padding: 0;
} 


/* Dark mode */
 header {
    display: flex;
    justify-content: right;
    color: var(--textColor);
}

#btn {
    background: none;
    position: absolute;
    top: 10px;
    right: 5px;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: var(--textColor);
}

/* list */
 h1 {
    text-align: center;
    margin-top: 30px;
}  

 #taskInput {
    display: block;
    width: 65%;
    padding: 7px;
    font-size: 18px;
    margin: 10px auto;
}

#addTask {
    display: block;
    padding: 10px 20px;
    background-color: #55c558;
    color: white;
    cursor: pointer;
    font-size: 18px;
    border: none;
    border-radius: 5px;
    margin: 0 auto;
}

#addTask:hover {
    background-color: #4b9c50;
}

ul {
    list-style-type: none;
    padding: 0;
    margin: 0 auto;
    width: 70%;
    background-color: var(--bgColor);
}

li {
    background-color: var(--bgColor);
    padding: 10px;
    margin: 5px 0;
    border-radius: 5px;
    border: 1px solid #ddd;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.delete {
    background-color: #f44336;
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 3px;
    cursor: pointer;
}

.delete:hover {
    background-color: #dd1919;
}

.completed {
    text-decoration: line-through;
    opacity: 0.5;
}