todo.css

body {
    font-family: Arial;
    width: 100vw;
    background-color: antiquewhite;
}   

#main-heading {
    /* margin-left: .130px; */
    color: blueviolet;
    /* text-align: center; */
}

.grid-box {
    display: grid;
    grid-template-columns: 200px 150px 100px;
    column-gap: 10px;
    row-gap: 10px;
    margin-top: 10px;
    align-items: center;
}

#todo-input, #todo-date {
    font-size: 20px;
    padding: 10px 5px;
}

.btn-delete {
    background-color: maroon;
    color: white;
    border: none;
    border-radius: 10px;
    padding: 15px 0px;
    font-size: 20px;
    cursor: pointer;
}

.btn-todo {
    background-color: green;
    color: white;
    border: none;
    border-radius: 10px;
    padding: 15px 0px;
    font-size: 20px;
    cursor: pointer;
}

.center{
    display: flex;
    align-items: center;
    flex-direction: column;
}