style.css

body {
    background-color: rgb(99, 182, 99);
    padding: 0;
    margin: 0;
}

.container {
    width: 1110px;
    margin: auto;
}

header {
    padding: 30px;
    text-align: center;
    font-size: 40px;
    font-family: 'Montserrat', sans-serif;
    border-bottom: 2px solid #000;
}

.options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 50px;
}

#list, option {
    border-radius: 15px;
    padding: 10px;
    width: 150px;
}

#listname, .btn-submit,  #to-do-items, .deleteBtn {
    border: 1px solid grey;
    padding: 10px;
    border-radius: 30px;
    width: 300px;
    font-family: 'Montserrat', sans-serif;
}

.deleteBtn {
    width: auto;
    padding: 10px 20px;
    transition: all 0.5s ease;
}

.deleteBtn:hover,
.btn-delete-items:hover {
    background-color: rgb(230, 106, 106);
}

.btn-submit {
    width: auto;
    transition: all 0.5s ease;
}

.btn-submit:hover {
    background-color: rgb(7, 247, 7);
}

.items-to-do {
    margin: 150px auto 0;
    max-width: 500px;
}

#duties-title {
    font-family: 'Ubuntu', sans-serif;
    font-size: 35px;
    text-align: center;
}

.btn-submit-items, .btn-delete-items {
    height: 38px;
    width: 38px;
    border-radius: 30px;
    border: none;
    transition: all 0.5s ease;
}

.btn-submit-items {
    margin-left: 10px;
}

.btn-delete-items {
    width: auto;
    margin-left: 30px;
    font-weight: 900;
    margin-left: auto;
}

.btn-submit-items:hover {
    background-color: rgb(7, 247, 7);
}

.style-of-list-item {
    font-size: 20px;
    font-family: 'Ubuntu', sans-serif;
    display: flex;
    align-items: center;
}

.items-to-do__input {
    display: flex;
    justify-content: center;
    margin-bottom: 50px;
}

.done {
    font-size: 20px;
    font-weight: 500;
    font-family: 'Montserrat', sans-serif;
    display: block;
}