* {
    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); */
    background-color: #191970;
    padding: 10px;
}

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

.todo-app h2 {
    color: #191970;
    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: #edeef0;
    border-radius: 30px;
    padding-left: 20px;
    margin-bottom: 25px;
    max-width: 100%;
    border:2px solid #191970;
    border-right: none;
}

input {
    width:100%;
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 10px;
    font-size: 20px;
    color:#191970;
}
::placeholder {
    color: #535393;
    opacity: 1; /* Firefox */
  }

button {
    border: none;
    outline: none;
    padding: 16px 50px;
    background: #191970;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    border-radius: 40px;
    font-weight: 700;    
}

ul li {
    list-style: none;
    font-size: 20px;
    padding: 12px 8px 12px 50px;
    user-select: none;
    cursor: pointer;
    position: relative;
    color:#191970;
}
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:8px;
    left: 8px;
}
ul li.checked {
    color:#191970;
    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:26px;
    color:#555;
    line-height: 40px;
    font-weight: 800;
    text-align: center;
    border-radius: 50%;
    color: #191970;
}
ul li span:hover {
    background: #edeef0;
}