*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html,body{
    width: 100%;
    height: 100%;
}
.container{
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg,#153677,#4e085f);
    padding:10px;
    display: flex;
    
}
.todo-app{
    height: 450px;
    width: 400px;
    background-color: white;
    float: left;
    margin-top: 10%;
    margin-left: 35%;
    border-radius: 20px;
}
.header{
    display: flex;
    width:100%;
}
.header h2{
    font-size: 40px;
    margin-top: 10px;
    margin-left: 20px;
}
.header img{
    width: 40px;
    height: 40px;
    margin-left: 40px;
    margin-top: 10px;
}
.input-div{
    /* background-color: black; */
    width: 100%;
    height: 15%;
    display: flex;
}
#input-box{
    margin-top: 2%;
    width: 100px;
    margin-left: 10%;
    width: 300px;
    height: 50px;
    border-radius: 20px;
    outline: none;
    background: transparent;
    border: 1px solid black;
    /* flex: 1; */
    padding: 10px;
    font-weight: 14px;
    font-size: 20px;
}
button{
    width: 80px;
    height: 50px;
    margin-top: 2%;
    margin-left: -80px;
    border-radius: 20px;
    background-color: rgba(255, 0, 0, 0.898);
    outline: none;
    border: 1px solid black;
}
button:hover{
    background-color: rgba(255, 0, 0, 0.734);
}
ul li{
    font-size: 17px;
    padding: 12px 8px 12px 50px;
    list-style: none;
    cursor: pointer;
    position: relative;
    display: flex;
}
ul li::before{
    content: '';
    height: 28px;
    width: 28px;
    border-radius: 50%;
    background-image: url(./images/unchecked.png);
    background-size: cover;
    background-position: center;
    top: 12px;
    left: 8px;
    position: absolute;
}
ul li.checked{
text-decoration: line-through;
color: #555;
}
ul li.checked::before{
    background-image: url(./images/checked.png);
}
ul li span{
    position: absolute;
    right: 30px;
    font-size: 25px;
    width: 25px;
    height: 25px;
    font-weight: 20px;
    text-align: center;
    /* margin-top: 0px; */
}
ul li span:hover{
    background-color: grey;
    border-radius: 50%;
}