styles.css

*{
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
    box-sizing: border-box;
}

.container {
    background: linear-gradient(-45deg, #FFED21, #FF9E16, #FF4F0B, #FF0000);
	background-size: 400% 400%;
	animation: gradient 15s ease infinite;
	height: 100vh;
    width: 100%;
    min-height: 100vh;
    padding: 10px;
}

.todo-app {
    background-color: #fff;
    width: 100%;
    max-width: 540px;
    border-radius: 10px;
    margin: 100px auto 20px;
    padding: 40px 30px 70px;
    transition: box-shadow 0.3s ease-in-out;
}

.todo-app:hover {
    box-shadow: 10px 10px 0px -1px #002765;
}

.todo-app h2 {
    color: #002765;
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

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

.row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #edeef0;
    padding-left: 20px;
    margin-bottom: 25px;
    border-radius: 30px;
}

input {
    flex: 1;
    border: none;
    background: transparent;
    padding: 10px;
    outline: none;
}

button {
    outline: none;
    border: none;
    padding: 16px 50px;
    background-color: #ff5945;
    color: #fff;
    font-size: 16px;
    border-radius: 40px;
    cursor: pointer;
}

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

ul li::before {
    content: '';
    width: 28px;
    height: 28px;
    border-radius: 50%;
    position: absolute;
    top: 8px;
    left: 8px;
    background-image: url(./images/unchecked.png);
    background-size: cover;
    background-position: center;
}

ul li.checked {
    color: #555;
    text-decoration: line-through;
}

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

ul li span {
    position: absolute;
    right: 0;
    top: 8px;
    width: 40px;
    height: 40px;
    font-size: 22px;
    color: #555;
    line-height: 40px;
    text-align: center;
    border-radius: 50%;
}

ul li span:hover {
    background: #edeef0;
}

@keyframes gradient {
	0% {
		background-position: 0% 50%;
	}
	50% {
		background-position: 100% 50%;
	}
	100% {
		background-position: 0% 50%;
	}
}