*{
    margin:0px;
    padding: 0px;
}

.container{
    background:linear-gradient(135deg,red,blue);
    width: 100%;
    height: 100vh;
    
    display: flex;
    justify-content: center;
    align-items: center;
    font-family:'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}
.content{
    background-color: white;
    padding: 20px 30px;
    border-radius: 20px;
}
nav{
    display: flex;
    align-items: center;
    gap: 20px;
}
.input{
    display: flex;
    border:1px solid rgb(228, 104, 15);
    border-radius: 20px;

}
.input input{
    border: none;
    outline: none;
    padding: 10px;
    font-size: 20px;
    border-radius: 20px;
    color:rgb(228, 104, 15);
    font-weight: bold
}
.input button{
    border: none;
    outline: none;
    background-color: rgb(228, 104, 15);
    color:white;
    padding: 10px 30px;
    font-size: 20px;
    border-radius: 20px;
}
.list{
    margin-top: 20px;
    margin-left: 20px;
}
.list ul li{
    list-style: none;
    margin:10px;
    position: relative;
    font-size: 17px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;

}
.list ul li img{
    display: none;
}

.list ul li img:hover{
    display: block;
    background-color: cyan;
    border-radius: 50%;
    filter:invert(1);
}
.list ul li::before{
    content: '';
    position:absolute;
    left:-34px;
    height: 20px;
    width: 20px;
    border-radius: 50%;
    background-image: url("images/unchecked.png");
    background-size: cover;
    background-position: center;
 
}
ul li.checked{
    color: #555;
    text-decoration: line-through;

}
ul li.checked::before{
    background-image: url("images/checked.png");

}