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

.container {
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(135deg, #153677, #4e085f);
    padding: 10px;
}

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

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

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

}

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

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

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

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;
    border-radius: 50%;
    background-image: url(unchecked-25.png);
    background-size: cover;
    background-position: center;
    top: 12px;
    left: 8px;

}

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

ul li.checked::before{
    background-image: url(png-transparent-check-mark-computer-icons-a-text-trademark-orange-thumbnail.png);
}