*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
    letter-spacing: 1px;
    text-transform: capitalize;
}
body{
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(.45deg, blue, red);
}
.container{
    height: 450px;
    width: 300px;
    border-radius: 5px;
    background-color: #f5f0f0;
    padding: 10px;
    overflow-y: auto;
    box-shadow: 0 5px 7px -3px;
}
#input{
    height: 65px;
    width: 100%;
    outline: none;
    border: none;
    background: #666;
    color: #fff;
    margin: 15px 0;
    border-radius: 5px;
    padding: 0 10px;
}
#input::placeholder{
    color: #bbb;
}
ul li{
    border-radius: 15px;
    background: rgb(201, 195, 195);
    color: #333;
    margin: 10px 0;
    padding: 10px;
    width: 100%;
    position: relative;
}
ul .fa-solid{
    position: absolute;
    cursor: pointer;
}
ul .fa-check{
    color:green;
    font-size: 25px;
    right: 40px;
}
ul .fa-trash{
    color:red;
    font-size: 20px;
    right: 15px;
}
.checked{
    background: lightgreen;
    text-decoration: line-through;
    transition: 0.3s;
}