body{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    box-sizing: border-box;
    
}

.container{
    width: 100%;
    min-height: 100vh;
    background-image: linear-gradient(rgba(0,0,0,0.75),rgba(0,0,0,0.75)),url(todo.jpg);
	background-size: cover;
	background-position: center;
    padding: 10px;
}

.todo-app{
    background: linear-gradient(135deg, #153677, #4e085f);
    width: 100%;
    max-width: 540px;
    margin: 100px auto 20px; 
    padding: 40px 30px 70px;
    border-radius: 10px;
}

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

.row input{
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 10px;
    font-weight: 14px;
}

.row button{
    border: none;
    outline: none;
    padding: 16px 50px;
    background: #ff5945;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    border-radius: 30px;
}

ul li{
    list-style: none;
    font-size: 17px;
    padding: 12px 8px 12px 20px;
    user-select: none;
    cursor: pointer;
    position: relative;
}

ul li::before{
   content: '';
   position: absolute;
   height: 28px;
   width: 28px;
   border-radius: 50%;
   background-image: url();
   background-size: cover;
   top: 12px;
   left:8px;
}

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

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

ul li span{
    position: absolute;
    right: 0;
    top: 5px;
    width: 40px;
    height: 40px;
    font-size: 22px;
    color: #555;
    line-height: 40px;
    text-align: center;
    border-radius: 50px;
}

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

/* Small screens (phones) */
@media (max-width: 576px) {
    .container {
        padding: 5px;
    }

    .todo-app {
        margin: 50px auto 10px;
        padding: 20px 15px 40px;
        width: 85%;
    }

    .row {
        padding-left: 10px;
        margin-bottom: 15px;
    }

    .row input {
        padding: 8px;
        font-size: 12px;
    }

    .row button {
        padding: 10px 30px;
        font-size: 14px;
    }

    ul li {
        font-size: 14px;
        padding: 8px 6px 8px 12px;
    }

    ul li::before {
        height: 20px;
        width: 20px;
        top: 8px;
        left: 6px;
    }

    ul li span {
        width: 30px;
        height: 30px;
        font-size: 18px;
    }
}