* {
    margin: 0;
    padding: 0;
    font-family: Helvetica;
    box-sizing: border-box;
    color: #f5f5f5;
}

.container {
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(145deg, #2f1a5b, #000000);
    padding: 10px;
}

.todo-app {
    width: 100%;
    max-width: 540px;
    background: #23223dac;
    margin: 100px auto 20px;
    padding: 40px 30px 70px;
    border-radius: 10px;
}

.todo-app h2{
    color: #f5f5f5 ;
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.todo-app h2 img {
    width: 30px;
    margin-left: 10px;
}

.row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #2f2a46ac;
    border-radius: 30px;
    padding-left: 10px;
    margin-bottom: 25px;
}

input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 10px;
    font-size: 16px;
    color: #f5f5f5;
}

button {
    border: none;
    outline: none;
    padding: 16px 50px;
    background: #30305888;
    color: #f5f5f5;
    font-size: 16px;
    cursor: pointer;
    border-radius: 40px;
    transition: background-color 0.3s ease;
}

ul li {
    list-style: none;
    font-size: 17px;
    padding: 12px 8px 12px 50px;
    user-select: none;
    cursor: pointer;
    position: relative;
}

ul li::before {
    content: '';
    position: absolute;
    height: 28px;
    width: 28px;
    background-image: url(images/checkbox.png);
    background-size: cover;
    background-position: center;
    top: 8px;
    left: 8px;
}

ul li.checked {
    color: #71728d;
    text-decoration: line-through;
}

ul li.checked::before {
    background-image: url(images/checked.png);
}

ul li span {
    position: absolute;
    right: 0;
    top: 5px;
    width: 40px;
    height: 40px;
    font-size: 22px;
    color: #f5f5f5;
    line-height: 40px;
    text-align: center;
    border-radius: 32%;
}

ul li span:hover {
    background: #303058;
}

button:hover {
    background-color: #303058;
}

button:active {
    background-color: #3b3b5ccf;
}

::placeholder {
    color: #777b99a4;
    opacity: 1;
}

.footer {
    position: absolute;
    bottom: 1%;
    left: 50%;
    font-size: 0.4rem;
}