*{
    margin: 0;
    padding: 0;
    font-family: "Poppins", sans-serif;
    box-sizing: border-box;
}
.container {
    width: 100%;
    height: 100vh;
    background: rgb(255,44,44);
background: linear-gradient(135deg, rgba(255,44,44,1) 0%, rgba(32,25,84,1) 100%);
padding: 10px;
}
.todoapp {
    width: 100%;
    max-width: 540px;
    background: white;
    margin: 100px auto 20px;
    padding: 40px 30px 70px;
    border-radius: 10px;
}
.todoapp h2{
    color: rgb(70, 70, 158);
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}
.todoapp h2 img{
    width: 30px;
    margin-left: 10px;
}
.row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgb(255, 230, 230);
border-radius: 30px;
padding-left: 20px;
}

input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 10px;
}
button{
    border: none;
    outline: none;
    padding: 16px 50px;
    background-color: rgb(234, 154, 93);
    color: white;
    font-size: 16px;
    cursor: pointer;
border-radius: 40px;
}
ul li {
    position: relative;
    list-style: none;
    font-size: 17px;
    padding: 15px 8px 12px 50px;
    user-select: none;
    cursor: pointer;
}
ul li::before {
    content: "";
    position: absolute;
    height: 28px;
    width: 28px;
    border-radius: 50%;
    background-image: url(images/unchecked.png);
    background-size: cover;
    background-position: center;
    top: 14px;
    left: 8px;
}
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: rgb(255, 0, 0);
    line-height: 40px;
    text-align: center;
    transition: .25s;
}
ul li span:hover {
    background-color: rgb(232, 232, 255);
}