.container{
    width:100%;
    background:linear-gradient(135deg,rgb(4, 213, 255),rgb(114, 96, 151));
    min-height: 100vh;
    padding:20px;
}
*{
    box-sizing: border-box;
    font-family: sans-serif;
    font-style: bold;
   
}
.to-do {
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 20px 10px rgba(0, 0, 0, 0.1);
    width:100%;
    max-width: 500px;
    margin: 100px auto 20px;
}

.to-do h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #333;
    font-family: sans-serif;
    font-style: bold;
}
.to-do form {
    text-align: center;
}
input{
    
    background:transparent;
    padding:10px;
    border-radius: 16px;
    outline:none;
}
button{
    border:none;
    outline:none;
    padding:16px 50px;
    border-radius: 40px;
    background-color:lightblue;
}
button:hover{
    background-color: rgb(4, 213, 255);
    cursor: pointer;
}
ul li{
    list-style: none;
    font-size:15px;
    padding: 12px 8px 12px 50px;
    user-select: none;
    cursor:pointer;
    position: relative;
}
ul li::before{
    content: "";
    position: absolute;
    height:28px;
    width:28px;
    border-radius:50%;
    background-image: url("./images/unchecked2.png");
    background-size: cover;
    background-position:center;
    top:12px;
    left:8px;
}
ul li.checked::before{
    background-image: url("./images/checked.png");
}
ul li.checked{
    text-decoration: line-through;
    color: #999;
}
ul li span{
    position:absolute;
    right:0;
    top:5px;
    width:40px;
    height:40px;
    font-size:22px;
    line-height: 40px;
    text-align: center;
}
ul li span:hover{
    background-color: rgb(204, 218, 223);
    border-radius: 50%;
    cursor: pointer;
}