style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@100,200,300,400,500,600,700,800,900&display=swap');
*{
    margin: 0;
    padding: 0;
    font-family: 'Poppins',sans-sarif;
}
.title{
    font-size: 30px;
    font-weight: 600;
    color:rgb(8,6,133);
    letter-spacing: 1px;
    margin: 30px 0;
}
body{
    background: #f5f5f5;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}
.todo-list{
    margin-bottom: 200px;
    width: 450px;
    padding: 20px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    border-radius: 5px;
    background-color: #fff;
}
.list-head{
    display: grid;
    grid-template-columns: 4fr 1fr;
    grid-gap: 20px;
}
.entered-list{
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ccc;
    font-size: 16px;
}
.add-list{
    border: none;
    border-radius: 5px;
    background-color: rgb(8,6,133);
    outline: none;
    font-size: 16px;
    color: #fff;
    cursor: pointer;
    opacity: .6;
    pointer-events: none;
}
.add-list.active{
    opacity: 1;
    pointer-events: all;
}
.tasks{
    margin-top: 30px;
    width: 100%;
}
.tasks h2{
    margin-bottom: 15px;
    margin-left: 140px;
}
.item{
    padding: 10px;
    border-radius: 5px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.item.completed p{
    text-decoration: line-through;
    color: #11111180;
} 
.item p{
    font-size: 16px;
    font-weight: 400;
    color:#111;
    letter-spacing: 1px;
}
.item-btn{
    display: flex;
    align-items: center;
    gap: 10px;
}
.item-btn i{
    color:rgb(8,6,133);
    font-size: 18px;
    cursor: pointer;
}
.warnings{
    display: flex;
    justify-content: center;
    align-items: center;
    width: 500px;
    height: 50px;
    /* border: 2px solid black; */
}
.warnings p{
    font-size: 28px;
    font-weight: 700;
    color: red;
}