style.css

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

body{
    height: 100vh;
    width: 100%;
    font-family: 'Times New Roman', Times, serif;
    display: flex;
}

.container{
    background: linear-gradient(#01ffff,#0cf3cd);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
.todo-list{
    background-color: aliceblue;
    display: flex;
    flex-direction: column;
    min-width: 400px;
    max-width: 600px;
    border-radius: 10px;
    height: 500px;
    box-shadow: 0px 0px 20px;
}

.header{
    padding: 2em;
}
.header h1{
    color: black;
    text-align: center;
}

.list{
    flex-grow: 1;
    padding: 2em;
    overflow-y: scroll;
}

.list ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

.list ul li{
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.delete{
    cursor: pointer;
}

.list ul li i{
    cursor: pointer;
    color: #f3420cea;
    padding: 1em;
}

.list ul li i:hover{
    background-color: #f1f1f17e;
}

.add-task{
     padding: 2em;
     display: flex;
}
.add-task input{
        border: 1px solid rgb(245, 238, 238);
        border-top-left-radius: 5px;
        border-bottom-left-radius: 5px;
        flex-grow: 1;
        padding: 1em;
        outline: none;
}

.add-task input:hover{
          border: 1px solid #DDD;
}

.add-task input:active{
          border: 1px solid #CCC;
}

.add-task input:focus{
          border: 1px solid #fff;
}

.add-task button{
    outline: none;
    border: none;
    padding: 1em;
    border-top-right-radius: 5px;
    border-bottom-right-radius: 5px;
    background-color: #f5f100ee;
    color: white;
    cursor: pointer;
}

::-webkit-scrollbar{
    width: 5px;
}

::-webkit-scrollbar-track{
    box-shadow: inset 0 0 5px #ccc ;
    border: 5px;
}

::-webkit-scrollbar-thumb{
    background: #566573;
    border-radius: 20px;
}