*{
    padding: 0;
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    box-sizing: border-box;
}
.container{
    width: 100%;
    height: 100vh;
    background: linear-gradient(45deg, #405DE6, #5851DB, #833AB4, #C13584, #E1306C, #fd1d1d);
    padding: 10px;
}
.todo-app{
    width: 100%;
    max-width: 550px;
    background: #fff;
    margin: 100px auto 20px;
    padding: 40px 30px 70px;
    border-radius: 20px;
}
.todo-app h2{
    color: purple;
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    margin-left: 30px;
    font-weight: 700;
    font-size: 2rem;
}
.todo-app h2 img{
    height: 40px;
    width: 40px;
    border-radius: 50%;
    margin-left: 10px;
}
.row{
   display: flex;
   align-items: center;
   justify-content: space-between;
   background: whitesmoke;
   height: 40px;
   border-radius: 30px;
   padding-left: 20px;
   margin: 25px;
}
input{
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    font-weight: 300;
}
button{
    background: palevioletred;
    height: 40px;
    width: 70px;
    border-top-right-radius: 30px;
    border-bottom-right-radius: 30px;
    border: none;
    outline: none;
    font-weight: 300;
    align-items: center;
    padding-right: 10px;
}
ul li{
    list-style: none;
    font-size: 1rem;
    padding: 20px 10px 15px 50px;
    user-select: none;
    cursor: pointer;
position: relative;
}
ul li::before{
    content: '';
    position: absolute;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background-image: url("back-check.png");
    background-size: cover;
    background-position: center;
    top: 12px;
    left: 8px;

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

}
ul li.checked::before{
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-image: url("checkbox.png");
    top: 12px;
    left: 8px;
}
ul li span{
    position: absolute;
    right: 0;
    top: 10px;
    width: 30px;
    height: 30px;
    font-size: 1.2rem;
    color: black;
    line-height: 40px;
    text-align: center;
    border-radius: 50%;
}
ul li span:hover{
        background: whitesmoke;
}