style.css

*,
*::after,
*::before {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

body {
    font-size: 20px;
    color: black;
    background: rgb(170, 167, 167);
}

.wrapper {
    max-width: 1140px;
    height: auto;
    margin: 50px auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.form {
    max-width: 500px;
    padding: 20px 10px;
    margin-bottom: 50px;
    background: rgb(179, 239, 245);
    border-radius: 10px;
    border: 1px solid gray;
 }

.input-todo {
    display: inline-block;
    padding: 8px 10px;
    margin: 0 auto;
    width: 400px;
    height: 50px;
    justify-content: center;
    border-radius: 10px;
    border: 1px solid black;
    font-size: 20px;
    
}

.btn {
    width: 400px;
    height: 50px;
    display: inline-block;
    padding: 10px;
    margin-top: 30px;
    margin-bottom: 20px;
    border-radius: 10px;
    background-color: #6ab89a;
    border: 1px solid black;
    font-size: 25px;
    font-weight: bold;
    cursor: pointer;
    transition: 1s;

}

.btn:hover {
    background-color: #127c80;
    transition: 1s;
}

.label-todo {
    display: inline-block;
    margin-bottom: 25px;
    font-size: 35px;
    font-weight: bold;
}

.mytodolist {
    margin-bottom: 25px;
    font-size: 35px;
}

.todo-list {
    width: 500px;
    height: 50px;
    text-align: center;
    border: 1px solid rgb(32, 32, 32);
    border-radius: 10px;
    /* padding: 10px 20px; */
    font-size: 20px;
}

.todo-item {
    width: 500px;
    height: 50px;
    margin: 0 auto;
    padding: 10px 20px;
    text-align: center;
    font-size: 20px;
    background-color: #1a8d24;
    border-radius: 10px;
}

.todo-item + .todo-item {
    margin-top: 20px;
}