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

.container{
    margin: 0;
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(130deg, #3d40c5, #cd44bb);
    padding: 10px;
}

.to-do-app{
    width: 100%;
    max-width: 350px;
    background-color: #fff;
    margin:100px auto 20px;
    padding: 30px 30px 70px;
    border-radius: 10px;

}

.to-do-app h2{
    padding-bottom: 15px;
    text-align: center;
}

.add-button{
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgb(206, 201, 201) ;
    padding: 0, 15px, 0, 5px;
    border-radius: 10px;
    margin-bottom: 20px; 
} 

.to-do-app .add-button input{
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 10px;
    font-weight: 14px;
}

.to-do-app .add-button button{
    border: none;
    outline: none;
    padding: 12px 20px;
    background: linear-gradient(130deg, #f06edf, #696bed);
    color: #fff;
    font-size: 16px;
    border-radius: 10px;
    cursor: pointer;
}

.container li{
  list-style: none;
  font-size: 16px;
  padding: 14px 8px 14px 40px;  
  cursor: pointer;
  position: relative;
}

.container li::before{
    content: '';
    position: absolute;
    height: 25px;
    width: 25px;
    background-image: url(images/uncheckbox.png);
    background-size: cover;
    background-position: center;
    top: 11px;
    left: 8px;
}
.container li.checked{
    text-decoration: line-through;
    color: #444448;
}

.container li.checked::before{
    background-image: url(images/fil-checkedbox.png);
}
.container li span{
    position: absolute;
    right: 0;
    top: 5px;
    width: 30px;
    height: 30px;
    font-size: 22px;
    color: #444448;
    line-height: 30px;
    text-align: center;
}
.container li span:hover{
    background:  rgb(206, 201, 201);
    border-radius: 5px;
}