style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Rum Raisin", sans-serif;
    font-weight: 400;
    font-style: normal;
}

.container {
    width: 100%;
    min-height: 100vh;
    background-color: #FFD4D4;
    padding: 10px;
    justify-content: center;
}

.todolist {
    width: 100%;
    max-width: 500px;
    background-color: #fff;
    margin: 100px auto 100px;
    padding: 50px 50px 65px; 
    border-radius: 35px;
    justify-content: center;
}

.todolist h2 {
    align-items: center;
    color: F05A7E;
    margin-bottom: 20px;
    text-align: center;
}

.row {
    display: flex;
    margin-top: 20px;
    margin-bottom: 20px;
    border-radius: 30px;
    padding-left: 20px;
    justify-content: space-between;
    align-items: center;
    background-color: #FFD4D4;
}

input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 10px;
    font-size: 14px;
}

button {
    border: none;
    outline: none;
    background: #FFB6B9;
    padding: 15px 35px;
    border-radius: 30px;
    font-size: 14px;
    cursor: pointer;
}

ul li {
    list-style: none;
    font-size: 16px;
    padding: 12px 15px 12px 50px;
    user-select: none;
    cursor: pointer;
    position: relative;
}

ul li::before {
    content: "";
    position: absolute;
    height: 25px;
    width: 25px;
    border-radius: 50%;
    background-image: url(./assets/uncheck.png);
    background-size: cover;
    background-position: center;
    top: 10px;
    left: 8px;
}

ul li.check {
    color: #b0acac;
    text-decoration: line-through;
}

ul li.check::before {
    background-image: url(./assets/check.png);
}

ul li span {
    color: #b0acac;
    position: absolute;
    right: 0;
    top: 5px;
    width: 30px;
    height: 30px;
    font-size: 25px;
    text-align: center;
    line-height: 35px;
}

ul li span:hover {
    color: #FFB6B9;
}